How to fix grub 21 error

how to fix grub 21 error

Next, run setup (hd0). Boot your computer from the live CD. This problem can be solved by fixing the Grub Bootloader Configurations. This solution has been tested many times to make sure that it works, I.

Will know: How to fix grub 21 error

CRITICAL ERROR 84 L7
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How to fix grub 21 error

[Solved] How to Fix GRUB Load Errors and Recover Data? [MiniTool Tips]

When you boot your computer, you might find that your computer is stuck in Grub Loading Error 15, 17, 21, or Do you know what they are, the causes of these GRUB Load Errors, and how to fix them to make your computer go back to normal? This MiniTool article shows you the answers.

What Is GRUB Loading Error?

GRUB, which is also known as GNU GRUB, stands for GNU GRand Unified Bootloader. It is a boot loader package from the GNU Project. It provides you a choice to boot one of multiple operating systems installed on a computer or choose a specific pawno error 017 undefined symbol proxdetector configuration available on a particular operating system’s partitions.

It is similar to NTLDR or BOOTMGR on Windows. But, it supports inf error video driver not found Windows and Linux kernels and has more features. You need to configure GRUB properly when using your computer. If not, you might encounter different kinds of GRUB errors like Grub Loading Error 15, 17, 21, 22….

Tip: If you encounter the BOOTMGR is missing issue, you can refer to this article to solve it: 11 Solutions to "BOOTMGR Is Missing" Error in Windows 10/8/7; If you are facing NTLDR is missing issue, how to fix grub 21 error, you can read this post to get the solutions: 10 Solutions to Fix NTLDR Is Missing in Windows 10/8/7.

Now, we will introduce these common GRUB Loading Errors in the following content.

Common Grub Loading Errors

Usually, there are no error codes in Grub Stage 1. You might just receive the error message saying Hard Disk Error, Floppy Error, Read Error, or Geom Error. The GRUB loading error code always appears in Grub Stage or Stage

There are 4 common GRUB Loading Errors:

  1. Grub Loading How to fix grub 21 error 15: File not found. This GRUB Loading Error always appears when a specified file name cannot be found by the system.
  2. Grub Loading Error 17: Cannot mount selected partition. This GRUB Loading Error always appears when the required partition exists, but the type of file system is not recognized by GRUB.
  3. Grub Loading Error 21: Selected disk does not exist. This GRUB Loading Error always appears when the disk is not recognized by the BIOS in the system.
  4. Grub Loading Error 22: No such partition. This GRUB Loading Error always appears when a required partition is not on the selected disk.

Top Reasons for GRUB Loading Errors

Why do the GRUB Loading Errors occur when you boot your computer? Here, we collect some reasons and show them as follows:

  • The configuration of GRUB is improper.
  • GRUB is installed in a wrong location.
  • GRUB is deleted by mistake.
  • mbr is how to fix grub 21 error, you know what GRUB is, ribbon 3d max error common GRUB Loading Error codes, and the top main causes of these errors. Then, if you are bothered by the GRUB Loading Error, you must want to get rid of it immediately because you still need to use your computer to deal with your work. Keep reading to get the solutions.

    How to Fix GRUB Loading Errors?

    Focusing on these 4 GRUB Loading Errors, we will introduce 4 different solutions. You just need to select a suitable solution according to the error code you receive.

    How to Fix GRUB Loading Errors?

    1. How to fix GRUB Loading Error 15?
    2. How to fix GRUB Loading Error 17?
    3. How to fix GRUB Loading Error 21/22?

    How to Fix GRUB Loading Error 15?

    If you are bothered by Grub Loading Error 15, you need to make sure that the kernel file exists on your computer. Here, you need to shut down your PC and then boot it from the live CD. Then, you can mount /boot on your partition and then do the following: cd /boot ls

    This will give you the exact name of the kernel file. However, it is also possible that the kernel file is missing from your computer. If that is the case, you can still use the live CD to reinstall the system to get rid of the error.

    Grub Loading Error If you are encountering the Grub Loading Error 17, you should ensure that your root(x,y) settings are right in your sprers.eu You will need a distribution CD or Live CD to set up Grub as shown below, where (h0,0) means the first hard drive and the first partition on that drive.
    sudo grub
    root (hd0,0)
    setup (hd0)
    Exit
    1. Boot your computer from a live CD.
    2. Execute this command: sudo fdisk –l.
    3. You will probably get the following results:
    Disk /dev/sdb: GB, bytes
    heads, 63 sectors/track, cylinders, how to fix grub 21 error sectors
    Units = sectors of 1 * = bytes
    Sector size (logical/physical): bytes / bytes
    I/O size (minimum/optimal): bytes / bytes
    Disk identifier: 0x62fff
    Device Boot Start End Blocks Id System
    /dev/sdb1 7 HPFS/NTFS/exFAT
    /dev/sdb2 7 HPFS/NTFS/exFAT
    /dev/sdb3 f W95 Ext’d (LBA)

    Grub Loading Error To fix Grub error 21, first make sure the disk is correctly connected and detected by the BIOS, then boot the computer from the Ubuntu installation pawno 1. error. Now run Command Prompt as an administrator, and enter the following commands:
    $sudo -s
    #grub
    grub> find /boot/grub/stage1 (then cmd will return something like "hd0,0")
    grub> root (hd0,0)
    grub> setup (hd0)
    grub> quit

    Grub Loading Error You can use the Windows Installation Disc to run a Startup Repair and fix MBR.
    The Grub loading error generally occurs when Grub is trying to load a non-Windows system. So you can fix the MBR with the How to fix grub 21 error Repair option on the Windows Installation Disc and then re-install Grub. For Unix-like systems, use the distribution CD or Live CD. Also, to fix Grub error 22 easily, you can restart the computer and then press "F8" repeatedly until the options appear on your screen. Now, go back to the menu where there was an option to choose the operating system. Select the "Microsoft Windows Recovery Console.” For this, you may need your Windows installation disc to access the recovery console. Now, enter the number in front of the system drive listed when you are asked to choose the system drive. Next, how to fix grub 21 error, provide the account password as required. Now, run the command fixmbr and type "y" to confirm the operation. Lastly, press on"exit" and restart your PC.


    Part 3. How to Recover Data from the Unbootable Computer Caused by GRUB Loading Errors

    When your computer encounters GRUB loading errors, you can't boot the computer if the above solutions fail, how to fix grub 21 error. However, how can I recover data on the computer when this occurs? Don't worry. If this happens, you`ll need a powerful data recovery tool to make sure no important photos, videos, emails, or documents how to fix grub 21 error lost because of the GRUB loading errors.
    Recoverit Data Recovery can help you out on this issue. It can create bootable media for you to boot the unbootable computer and recover all kinds of data. Just follow the below steps:

    Your Safe & Reliable File Recovery Software

    • Recover lost or deleted files, photos, audio, music, fase4 rdf error from any storage device effectively, safely, and completely.
    • Supports data recovery from recycle bin, hard drive, memory card, flash drive, digital camera, and camcorders.
    • Supports to recover data for sudden deletion, formatting, hard drive corruption, virus attack, system crash under different situations.

    Step 1. After launching the Recoverit program, click on data recovery mode. If your windows 10 doesn't start, click the "Recover from Crash Computer" tab, then you will be prompted to click "Start" on the next window that pops up.

    recoverit

    Step 2. To create a booting drive, press the mode option. You will be presented with two booting options; the CD/DVD drive and the USB. You can choose any option among the two, then click on the "Create" button to commence the process.

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    Step 3. You will be prompted with another pop-up window asking to format your selected mode. So if you chose the USB option, tap on the "Format" tab. However, ensure you have relevant data backed up before you continue.

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    Step 4. The booting process will immediately. However, don't eject the USB flash drive during this process, how to fix grub 21 error. The next action you need to take will display on the screen or you can view the entire guide.

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    Step 5. The data recovery process would take a while, so ensure your laptop is plugged into a power source or ensure the battery is fully charged. Upon completion, three data recovery solution steps will be displayed on your screen.

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    Step 6. Before starting the recovery process, ensure that you have permitted your computer boot sequence to boot from the boot media you created earlier. When that has been done, restart your computer and immediately punch the F12 key.

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    Note that your BIOS (Basic Input/Output System) key will differ from system to system. Check out how to set the computer to boot from a USB drive.
    Step 7. When booting is completed, Recoverit software will start automatically. Now you can copy your hard drive data or start a recovery process on your Windows 10 lost data. We can help you resolve issues regarding lost data on Windows


    Closing Words

    Now you know what Grub loading error is and how you can fix this problem. Besides, if you lost your important Data Due to GRUB Loading Errors, a professional data recovery tool like Wondershare Recoverit is all you needed to get back your lost or deleted data files.

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    How to fix grub rescue in Windows 10 and Ubuntu dual boot: Bootloader error

    This tutorial is all about how to Fix Grub Bootloader after Deleting Ubuntu Partition?

    If you are trying to use dual boot OS setup on a pc with Ubuntu and Windows, then it is really a handy idea. While setting the system up like this, be very careful with all the aspects of the installation. But, if somehow accidentally you deleted the Ubuntu Linux partition from Windows (which is something not to be done anyway), then you are left with no way to go back, and also you will not find a way to boot into your windows system. As the action of deleting the Linux partition from windows lead you to a situation where only the grub rescue prompt is visible whenever you restart the pc because your Grub Bootloader is all messed up now. In this article, we are about to discuss the solution of this problem step by step.

    This problem can be solved by fixing the Grub Bootloader Configurations. This solution has been tested many times to make sure that it works, I even tested it by myself once, so this procedure is foolproof for sure (for most of the devices). There are normally two scenarios one may end up within this kind of Bootloader error.

    We will discuss those scenarios one by one.

    Not showing or Can’t How to fix grub 21 error into Windows on Ubuntu & Windows Partition

    (While booting into Ubuntu is still working)

    This type of issue can even arise when you have both the OS (Ubuntu & Windows) installed on your pc systematically. In this kind of scenario, both Ubuntu and Windows 10 partitions are intact within your Hard Disk drive. Still,  you are facing the problem, which means the Grub menu is unable to show the Windows boot option. If this is the case with you, there is quite a simple solution to android repository error out of this problem, the bootloader can be brought back as well as the Windows Boot Option into the OS Selection menu at the time of system startup.

    Things need to be noted before implementing this solution:

    • Both Ubuntu and Windows Partition still exist on the HDD.
    • None of the OS corrupted.
    • Windows boot option is how do you fix run-time error 429 shown on the bootloader list.

    Solution:

    • Switch on the pc and try to how to fix grub 21 error into Ubuntu OS normally
    • When at the desktop, launch the Linux command Terminal by pressing Ctrl+Alt+T
    • Type the given command in the terminal window, “sudo update-grub”
    • Now press Enter Key
    • Type in your own sudo password when asked by the system, to execute your command.
    • For mysql server error 1146, you can see the given image below                 Can’t Boot into Windows on Ubuntu
    • Now you can see in the terminal window, that the processing is going on hence, the system is generating the grub configuration file again. After a few moments, how to fix grub 21 error, once it found Windows (10) bootloader within the HDD, it will prompt you again.fix windows and ubutnu dual boot
    • Now restart the Pc. When the system boots up again, you will see automatically the option tyre error components classes is undefide boot into Windows is available in there again.

     

    How to restore Windows bootloader after deleting Ubuntu Partition: Grub rescue

    (Cannot boot into Ubuntu)

    Dual booting is a great way to increase range of functionality as well as productivity in a pc. As the user able to use both the platforms according to need, how to fix grub 21 error. Also, one OS can be used to recover corrupted data by using another OS. It is also a good idea to get the most juice out of an old laptop. Most of the users use this technique to have it as an advantage, as this setup can help the user to get the work done even when one OS failed to do the job. However, in a complex setup like this, it is also easy to get into trouble if the user accidentally or intentionally deleted the Ubuntu Linux partition. If you are using such dual boot system, it is oki 188 error that do not let use your pc used by anyone else. Whatever the reason is, deleting the Ubuntu partition will definitely mess up the Windows Boot Manager. So, while the Linux partition is deleted from the HDD and the user restart the pc, he/she will end up in the grub rescue prompt by default.

    Now we are going to talk about the solution for this bootloader corrupted issue…

    Things that need to meet before implementing this part of the tutorial:

    • Your pc had Dual boot setup.
    • The Ubuntu partition is deleted from Windows OS somehow.
    • Definitely Not Booting into Windows OS anymore.
    • By default, keep showing grub rescue prompt on the screen.                           grub rescue

    Requirements for the Solution

    • A bootable Ubuntu USB drive or CD drive.
    • In case of laptop connect the charger, as it is going to take a while.
    • A working internet connectivity (If your pc has a problem with Wi-Fi connectivity like missing driver or something, then the connection may not be possible, in that case only a LAN connected pc will work).


    Tutorial

    • Insert the Ubuntu bootable USB or CD whatever you are using.
    • Reboot the system
    • Enter into System BIOS Settings (by pressing Ctrl+Alt+Del or F9 or F2 or Del, how to fix grub 21 error, it depends on your Motherboard manufacturer.)
    • Select the Ubuntu USB or CD to boot from on BIOS Setting as the first booting device priority.
    • Wait for the of booting process to be completed from USB/CD.grub rescue fix
    • First try your luck with the “Try Ubuntu without Installing” option, as there is actually no need to reinstall the Ubuntu OS actually. Now a day most of the Linux distros has the facility of trying the OS without even installing it on the HDD. This will directly run the OS from the USB/CD.
    • Launch the Terminal by pressing Ctrl+Alt+T from Ubuntu desktop.
    • Now type in the following command “sudo apt-get install lilo” and press Enter, now this command will try to download the package over the internet and will install it automatically.
    • Hit Enter when the next dialog box that appears for the permission.
    • Now again, enter the command “sudo lilo -M /dev/sda mbr” and press Enter.fix grub rescue in windows and ubuntu dual boot
    • This command will automatically create a backup of the current configurations in a boot backup folder within the HDD, and if everything is completed successfully the it will show a successful completion message on the Ubuntu terminal stating “The Master Usb error 0701 Record of /dev/sda updated”.
    • This is it, now you are ready to restart the pc and also you should remove the USB/CD from the system. Now after fresh start the system will boot right into Windows OS as the default system.

    I hope these methods helped you and your problem is solved. These given methods are better than reinstalling the OS again, as this will save your time as well as your valuable data. For any more problem’s solution related to LINUX keep connected with our website, and do not think that you are one of those very few who uses dual bootloader system, as there are thousands of users around the world who use this type of setup including me and my team and many IT professionals.

    Other Useful Resource:

    The other day I was trying to extend my root partition of Ubuntu which I dual boot with Windows 8. The partition extension was successful except that I screwed up the Grub configuration. When I booted in my laptop after the partition changes, I was welcomed by the Death Screen of Linux saying:

    error: no such partition
    grub rescue

    After googling a bit, I found this mega thread on Ubuntu forum that helped me. But since it is a very complicated thread, I have re-written the tutorial so that one can follow it easily. So there are some assumption and some requirements to fix the error: no such partition grub rescue problem.

    Requirements and presumptions:

    • You must have a live CD/DVD/USB of the same version of OS
    • You must have internet connection
    • You are dual booting Windows with Ubuntu (no Wubi installation)
    • You do not have a separate /boot partition

    Now lets see how can we rescue the grub here.

    How To Fix: error: no such partition grub rescue

    We&#;ll be using chroot to rescue grub. The whole concept is that since grub configuration files have been deleted or corrupted, it needs to be re-installed. And using the live CD of exact OS version, we can install the grub configuration again. It will delete all the changes (if any) you have made to the grub.

    Please follow these steps to easily fix grub rescue problem in Ubuntu (or other Linux distributions):

    Step 1: Know you root partition

    Boot from live CD, DVD or USB drive. Try Ubuntu from live disk. Open a terminal (Ctrl+Alt+T) and use the following command:

    Here, you will see the drive name and partition number. It should look like sdXY. Where X is the drive letter and Y is the partition number. Usually it should be like sdaY.  You have to recognize the partition where root has been installed.

    Step 2: Mount the root partition

    Once we have got the partition where root has been installed, we&#;ll mount the root partition where Ubuntu has been installed. Use the following commands to mount it:

    Replace XY with appropriate values.

    Step 3: Be the CHROOT

    Once we have the partition mounted, next step is to mount certain items in preparation how to fix grub 21 error the chroot. Run the following commands one by one:

    If the above commands ran successfully, you&#;ll see [email&#;protected]:/# in the terminal indicating that you are in chroot mode.

    Step 4: Purge Grub 2 packages

    Now when we are in chroot environment (you can think of it as if we are behaving as root for the mounted partition)., time to get rid of the Grub 2 packages but before that lets update the repository.

    While removing the grub, you&#;ll see a strange screen asking if you want to remove Grub 2 packages, how to fix grub 21 error. Press TAB to select Yes. It will be highlighted once selected. Press enter to proceed.

    Solving Error no such partition grub rescue in Ubuntu

    Step 5: Re-install Grub packages

    As we deleted the previous Grub, we deleted the messed up settings as well as any favourite settings stored in it. Now we&#;ll install a new and fresh Grub. Few things to keep in mind before you go on with the command to install the Grub.

    • While installing the new Grub, it will ask you to add extra kernel options. Just press TAB to go to OK and press enter to continue.
    • It will bring you the installation notes. Press Tab to OK followed by enter and continue.
    • When it presents with you the device option (to ask on which partition should it install Grub), choose the option in the format of sdX. DO NOT select the drive partition in 4 letter format i.e. sda4 etc. When you select the partition,  it should have atioglxx.dll java error asterisk (*) before it like [*] sdX. If it does not, highlight (with tab) and press SPACE to select it. Tab OK and press enter.

    It should look like this:

    Solve Error no such partition grub rescue in Ubuntu

    Now when you taken all those things in mind, how to fix grub 21 error, use the command below to install the Grub.

    Update the grub and exit the chroot:

    Step 6: Unmount the partition:

    We mounted something at the start, didn&#;t we? Well lets just unmount them.

    That&#;s it. Reboot your system and you should see the good old Grub boot screen as before. I hope this tutorial helped you to get rid of error: no such partition grub rescue problem and the tutorial was easy to follow. Any question, suggestions or a word of thanks is always welcomed. Stay tuned for more Linux tutorials.

    Grub Rescue Commands to Fix Boot Issues

    grub rescue commands

    GRUB stands for GRand Unified Bootloader. It is the first software program which be run when your computer starts. The bootloader is in charge of loading and booting the operating system kernel. GRUB is the default bootloader for Linux kernel-based operating systems.

    In some cases, you have to run both Linux and Windows on the same machine (Laptop or PC), you may encounter some issues with GRUB. For example, if you install Windows after Linux installation, the Windows initiate its own bootloader on the MBR (Master Boot Record). So, GRUB is no longer available and you can&#;t boot into the Linux OS.

    This tutorial will go through some scenarios that make the GRUB unbootable and how to use GRUB commands in order to rescue your Linux OS from boot.

    When will the grub rescue commands be used?

    Nowadays, most of the Linux systems are using GRUB2 (grub version 2). GRUB2 is a replacement for GRUB bootloader.

    If the GRUB can not find the grub folder or the contents inside are corrupted, The GRUB prompt looks like:

    error: no such partition. grub rescue > _

    or

    error: unknown filesystem. grub how to fix grub 21 error > _

    or

    grub > _

    This error prevents you from booting into your operating system. The following sections will explain the way to fix this problem.

    How to fix grub rescue?

    Each of GRUB failed modes can be fixed by the grub terminal or live CD installer.

    At the grub command prompt, enter &#;ls&#; to see the disk how to fix grub 21 error and available partitions:

    grub > ls (hd0) (hd0,msdos2) (hd0,msdos1) grub > _

    Where:

    hd0: the hard disk

    msdos: the partition type

    Normally, the OS is booted from the first partition of the hard disk. In this case, to verify that the bootable partition is &#;msdos1&#;, let&#;s run the following command:

    grub > ls (hd0,msdos1)/

    Next, let&#;s explore the grub2 directory by running:

    grub > ls (hd0,msdos1)/grub2

    Output:

    sprers.eu  fonts  sprers.eu  sprers.eusave  grubenv  ipc  locale

    As you can see, the grub in Linux has its own configuration file: &#;sprers.eu&#.

    If you don&#;t see this file, you can create it by running the command:

    grub2-mkconfig

    In order to boot your system, let&#;s type:

    grub > set root=(hd0,msdos1) how to fix grub 21 error (hd0,msdos1)/vmlinuzel7.x86_64 root=/dev/sda1

    Running the &#;set root&#; will define the bootable partition. The default kernel is linux v

    Now, we have to define the path to grub2 directory:

    grub > set prefix=(hd0,msdos1)/grub2 grub > insmod normal

    Then:

    initrd (hd0,msdos1)/initramfsel7.x86_img

    Here also, you will need to change the partition to your boot partition.

    If you are unable to boot your system (which might be due to bad filesystem, or due to missing GRUB configuration file), you will need to boot from some other medium, how to fix grub 21 error. You can use some bootable rescue CD or the Live CD of your distribution if available.

    Once you have booted into your system, you might need to create the GRUB configuration files, if missing or if misconfigured. To create these configuration files, run:

    $ update-grub

    This command needs superuser privileges. So run this command (and the following commands in this article) as root.

    The next step is to install GRUB on the MBR. This will fix the problem caused by Windows, in which Windows installs its bootloader on MBR, after installation of Windows over Linux. Here I assume that you have booted from the Live or rescue CD.

    Now, before we go to the details of installing GRUB on MBR, we need to mount the root partition of Linux.

    $ sudo mount /dev/sda1 /mnt

    Here, the root partition is assumed to be &#;/dev/sda1&#. This partition is mounted on /mnt directory. You can choose your own mount point, and your root filesystem partition may be different.

    Now, we are ready to install GRUB. Run the following command:

    $ sudo grub-install --root-directory=/mnt/ /dev/sda

    This will install the GRUB on Master Boot Record. If you wish to install it on some partition, replace the last argument of the above command with the proper partition.

    Grub rescue by boot-repair

    Another way to rescue the grub on Ubuntu and almost of Linux distributions is using boot-repair tool. It&#;s a graphical utility that can repair the Grub2 bootloader by some clicks.

    You need to prepare a Live USB/DVD installer and boot into the live Linux environment. Then, let&#;s connect your live OS to the Internet, install boot-repair by running the following commands:

    $ sudo add-apt-repository -y ppa:yannubuntu/boot-repair $ sudo apt-get update $ sudo apt-get install -y boot-repair && boot-repair

    The boot-repair tool will be launched and you can select the &#;Recommend repair&#; button and follow some next steps to repair your bootloader.

    Conclusion

    In this tutorial, we learned how to use grub rescue command to fix the OS boot error. Thanks for reading and please leave your suggestion in the below comment section.

    Posted in Grub, LINUX HOWTO

    How to fix grub 21 error - speaking, obvious

    Methods to Fix Grub Loading Error []


    Part 1. What are GRUB and GRUB Loading Errors?

    GRUB stands for Grand Unified Bootloader, which is invoked by your system's BIOS to load kernels and display a boot menu for users to choose from. It's similar to NTLDR or BOOTMGR for Windows, but supports both Windows and Linux kernels, and comes with more features. However, if you haven't configured Grub properly, you will encounter GRUB errors like those described below.

    recoverit

    Grub Loading Error 15, 17, 21, 22

    For Grub Stage 1, there are no error numbers, just "Hard Disk Error", "Floppy Error", "Read Error", or "Geom Error". Hence, if you get an error number, you are probably using Grub Stage or Stage So, what does the Grub loading error number mean? Let's find out below:
    Grub Loading Error File not found. This error is displayed when the specified file name cannot be found.
    Grub Loading Error Cannot mount selected partition. This error is displayed when the partition requested exists, but the file system type is not be recognized by GRUB.
    Grub Loading Error Selected disk does not exist. This error is displayed if the disk is not recognized by the BIOS in the system.
    Grub Loading Error No such partition. This error is displayed if a requested partition isn't on the selected disk.

    What Causes GRUB Loading Errors 15, 17, 21, 22?

    Configuring GRB correctly whenever you install Windows and Linux on a computer is important to boot from one of the operating systems successfully. If not done correctly, it may lead to GRUB loading errors, such as errors 15, 17, 21, and The common reasons you are encountering the GRUB loading errors might be:

    • The corruption of MBR.
    • The configuration of GRUB is improper.
    • GRUB is installed at the wrong location.
    • GRUB is deleted by accident.

    Now that you are aware of what GRUB is, what are the common GRUB Loading Error codes, and the common reasons for these errors to occur, you might be looking for solutions rid of it immediately. So, if you are bothered by the GRUB Loading Error, and want to fix it to keep using your computer seamlessly to deal with your work, read on to get the solutions.


    Part 2. How to Fix Grub Loading Error

    Here are some simple solutions for all popular Grub loading errors.
    Grub Loading Error If Grub Loading Error 15 is bothering you, you need to make sure that the kernel file exists on your computer. To find out the exact kernel name you need to shut down your PC and then boot it from the Live CD. Then mount /boot on your partition, and then do the following: cd /boot

    [Solved] How to Fix GRUB Load Errors and Recover Data? [MiniTool Tips]

    When you boot your computer, you might find that your computer is stuck in Grub Loading Error 15, 17, 21, or Do you know what they are, the causes of these GRUB Load Errors, and how to fix them to make your computer go back to normal? This MiniTool article shows you the answers.

    What Is GRUB Loading Error?

    GRUB, which is also known as GNU GRUB, stands for GNU GRand Unified Bootloader. It is a boot loader package from the GNU Project. It provides you a choice to boot one of multiple operating systems installed on a computer or choose a specific kernel configuration available on a particular operating system’s partitions.

    It is similar to NTLDR or BOOTMGR on Windows. But, it supports both Windows and Linux kernels and has more features. You need to configure GRUB properly when using your computer. If not, you might encounter different kinds of GRUB errors like Grub Loading Error 15, 17, 21, 22….

    Tip: If you encounter the BOOTMGR is missing issue, you can refer to this article to solve it: 11 Solutions to "BOOTMGR Is Missing" Error in Windows 10/8/7; If you are facing NTLDR is missing issue, you can read this post to get the solutions: 10 Solutions to Fix NTLDR Is Missing in Windows 10/8/7.

    Now, we will introduce these common GRUB Loading Errors in the following content.

    Common Grub Loading Errors

    Usually, there are no error codes in Grub Stage 1. You might just receive the error message saying Hard Disk Error, Floppy Error, Read Error, or Geom Error. The GRUB loading error code always appears in Grub Stage or Stage

    There are 4 common GRUB Loading Errors:

    1. Grub Loading Error 15: File not found. This GRUB Loading Error always appears when a specified file name cannot be found by the system.
    2. Grub Loading Error 17: Cannot mount selected partition. This GRUB Loading Error always appears when the required partition exists, but the type of file system is not recognized by GRUB.
    3. Grub Loading Error 21: Selected disk does not exist. This GRUB Loading Error always appears when the disk is not recognized by the BIOS in the system.
    4. Grub Loading Error 22: No such partition. This GRUB Loading Error always appears when a required partition is not on the selected disk.

    Top Reasons for GRUB Loading Errors

    Why do the GRUB Loading Errors occur when you boot your computer? Here, we collect some reasons and show them as follows:

    • The configuration of GRUB is improper.
    • GRUB is installed in a wrong location.
    • GRUB is deleted by mistake.
    • mbr is corrupted.

    Now, you know what GRUB is, the common GRUB Loading Error codes, and the top main causes of these errors. Then, if you are bothered by the GRUB Loading Error, you must want to get rid of it immediately because you still need to use your computer to deal with your work. Keep reading to get the solutions.

    How to Fix GRUB Loading Errors?

    Focusing on these 4 GRUB Loading Errors, we will introduce 4 different solutions. You just need to select a suitable solution according to the error code you receive.

    How to Fix GRUB Loading Errors?

    1. How to fix GRUB Loading Error 15?
    2. How to fix GRUB Loading Error 17?
    3. How to fix GRUB Loading Error 21/22?

    How to Fix GRUB Loading Error 15?

    If you are bothered by Grub Loading Error 15, you need to make sure that the kernel file exists on your computer. Here, you need to shut down your PC and then boot it from the live CD. Then, you can mount /boot on your partition and then do the following: cd /boot ls to check the exact name of the kernel file.

    It is quite possible that the kernel file is missing from your computer. If so, you can still use the live CD to perform a system reinstallation to get rid of the issue.

    How to Fix GRUB Loading Error 17?

    If you are facing Grub Loading Error 17, you need to make sure that your root(x,y) settings are right in your sprers.eu You still need to use a live CD to set up Grub as follows:

    1. Boot your computer from a live CD.

    2. Execute this command: sudo fdisk –l.

    3. You are likely to get the following results:

    Disk /dev/sdb: GB, bytes

    heads, 63 sectors/track, cylinders, total sectors

    Units = sectors of 1 * = bytes

    Sector size (logical/physical): bytes / bytes

    I/O size (minimum/optimal): bytes / bytes

    Disk identifier: 0x62fff

    Device Boot Start End Blocks Id System

    /dev/sdb1 7 HPFS/NTFS/exFAT

    /dev/sdb2 7 HPFS/NTFS/exFAT

    /dev/sdb3 f W95 Ext’d (LBA)

    Partition table entries are not in disk order.

    The cause of the problem appears on the last line: Partition table entries are not in disk order.

    4. You can fix the problem by executing the following command: sudo fdisk /dev/hda. hda means the whole hard disk.

    5. If you are an expert, you can select x and press Enter. If you are not an expert, just skip to the next step.

    6. Select f and press Enter to fix the partition order.

    7. Select w and press Enter to write table to disk.

    8. Then, you need to finalize these command one by one in GRUB:

    sudo grub

    root (hd0,1)

    setup (hd0)

    quit

    Here, (h0, 1) stands for the first hard drive and the second partition on that drive.

    Of course, the above hd0,1 and hd0 are just examples. You need to know which hard disk houses your OS and then replace the numbers according to your actual situations.

    When all these steps are done, you can restart your computer to check whether it can work as normal.

    How to Fix GRUB Loading Error 21/22?

    If you are bothered by GRUB Loading Error 21/22, you can follow these steps to fix the problem.

    1. Boot your computer from the live CD.
    2. Open a terminal and then run sudo grub. This can lead you to a GRUB command line.
    3. Run find /boot/grub/stage1.
    4. Then, run root (hd0, 1). Here, (h0, 1) stands for the first hard drive and the second partition on that drive. You can replace these two numbers according to your own situation.
    5. Next, run setup (hd0).
    6. At last, run quit to complete the operation.

    After these 6 steps, you still need to reboot your computer to see whether the GRUB Loading Error 21 or GRUB Loading Error 22 is disappeared.

    If You Lose Your Data Due to GRUB Loading Errors

    After the GRUB Loading Errors are solved, you can use your computer as usual. However, you may find that some important files are missing from your device by accident due to the error. In a situation like this, you can use a professional data recovery software to get back your data. Here, we suggest using MiniTool Power Data Recovery.

    This free file recovery tool is specially designed to rescue your lost and deleted files from your computer hard drives, SD cards, memory cards, pen drives, CDs, DVDs, and more. It has 4 recovery modules that are designed for different situations.

    For example, if you want to recover data from a partition on the hard drive, you can use the This PC module. But, if you have repartitioned the hard drive after missing files, you’d better use the Hard Disk Drive module because it enables you to scan the entire drive at once.

    This software is designed for Windows computers. However, if your computer is dual-boot (Windows and Linux), you can choose to recover your Linux data under Windows.

    MiniTool Power Data Recovery has a trial edition and you can use it to scan the drive that has saved your lost files and then check whether it can find the files you want to restore. If you are interested in it, you can press the following button to download and then install it on your computer to have a try.

    Free Download

    After installing MiniTool Power Data Recovery on your device, you can use these steps to retrieve your data.

    1. Open this software and you will enter the This PC interface directly.

    2. Suppose that you want to recover data from a partition, you can just stay at this recovery module. Then, you need to select the target partition and press Scan to start the scanning process.

    select the target partition to scan

    3. The whole scanning process will last for a while. To make sure that you can get the best data recovery effect, you need to wait until the whole process ends. Then, this software will show you the scan results by path.

    Here, you can click each path and unfold the folders in it to find your needed files. However, you may find that it is not easy and fast to find the target items using this method. If so, you can use other features of this software to perform a quick search.

    For example:

    • Type: The Type feature can enable the software to show the scan results by type. You must know which type of data you want to recover. So, you can select that type to find your needed files quickly.
    • Show Lost Files: After scanning, this software will show you all the data on the drive including existing and deleted files. If you only need to restore the deleted files, you can use this feature to make the software only show you the lost files. This can narrow down the search range.
    • Find: If you still remember the name of the file you want to recover, you can use this feature to directly locate that file. However, if the name of the file is damaged, you will be unable to use this method to find your data.
    • Preview: This feature enables you to preview up to 70 types of files. So, if you are not sure whether it is the file you want to restore, you can just preview it to make a confirmation.
    Type, Show Lost Files, Find, and Preview

    4. You are not allowed to use this trial edition to recover the scanned files. However, you can update this software to a full edition and then recover your needed files without limits. If you are a personal user, the Personal Ultimate edition can fully meet your need and you can even enjoy a lifetime free update.

    Here, you need to know that you should not select the files’ original path to save these data. Otherwise, the deleted files will be overwritten and become unrecoverable.

    Bottom Line

    Now, you should know what GRUB is, the GRUB Loading Errors you may encounter when booting your PC, and how to get rid of these errors. At the same time, we also recommend a data recovery software for recovering your lost and deleted files that are caused by these GRUB Loading Errors. We hope this article is helpful to you.

    Should you have any related issues, you can contact us via [email&#;protected] or let us know in the comment.

    GRUB Loading Error FAQ

    What is a GRUB Loading Error?

    A GRUB Loading Error always happens when you boot the computer. It can be caused by improper GRUB configuration, a wrong location of GRUS, missing GRUB, corrupted MBR, etc.

    How do I fix grub loading errors?

    There are different kinds of GRUB Loading Errors like GRUB Loading Error 15, 17, 21, and This current article shows you the corresponding solutions. You can scroll up to find them.

    About The Author

    Stella

    StellaFollow us

    Position: Columnist

    Stella has been working in MiniTool Software as an English Editor for more than 4 years. Her articles mainly cover the fields of data recovery including storage media data recovery and phone data recovery, YouTube videos download, partition management, and video conversions.

    User Comments :

    If you have dual boot system ubuntu and windows  and you get this error unknown filesystem you would want to recover your windows first priority. You need to start your computer with extranal Ubuntu live CD or USB (if not sure see my other tutorial Creating a bootable USB stick&#; ).

    once you run ubuntu then you need to open commandline (Ctrl + Alt + t) you need to be root to access root type:

    sudo su

    Then type following commands successively

    sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt-get update && sudo apt-get install -y boot-repair && boot-repair

    Once done will open the boot-repair windows with two options choose the first option ( need to be patient it will take time).Restart computer without the CD or USB and see if it fixes the problem if not then run you live ubuntu again and type&#;gksu boot-repair&#; in the commandline. It will popup the window again and choose the second option. Restart and see if it fixes the problem if not follow the link here for further help.

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