Resolve GRUB Boot Loader Errors 15, 17, 21, 22, and Recover Data

What Is GRUB

GRUB, or GNU GRUB, stands for Grand Unified Bootloader. It is a bootloader employed on computers running multiple operating systems, allowing users to select which OS to boot from. Various operating systems require distinct bootloaders. For instance, NTLDR serves as the bootloader for Windows NT-based systems, while LILO is the bootloader for Linux. GRUB, on the other hand, functions as a bootloader for both Windows and Linux, typically utilized on computers with dual installations of these OSes.

Here's a brief overview of common GRUB bootloading errors and their corresponding solutions. Skip to the section that interests you the most:

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Common GRUB Loading Errors

However, using GRUB isn't without its issues. Many users have encountered the GRUB loading error while starting up their computer. GRUB comes in two versions, and if you're using Stage 1.5 or Stage 2.0, you might come across GRUB loading errors 15, 17, 21, or 22.

GRUB Loading Error 15

File not found. This error occurs when the specified file name cannot be located.

GRUB loading error 17

The selected partition couldn't be mounted. This error appears when the partition exists but GRUB can't recognize the file system type.

"GRUB loading error 21"

The selected disk does not exist. This error message appears if the disk is not recognized by the BIOS in the system.

"GRUB loading error 22"

No such partition. This error appears if the requested partition is not found on the selected disk.

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

When you install both Windows and Linux on a computer, it's essential to properly configure GRUB (Grand Unified Bootloader) to ensure successful booting from either operating system. Otherwise, you might encounter GRUB loading errors, such as errors 15, 17, 21, and 22. These common GRUB loading errors can stem from: 1. Incorrect configuration of the GRUB bootloader, leading to misidentification of the operating system partitions or boot files. 2. Damage or corruption to the GRUB files due to software updates, system crashes, or improper system shutdowns. 3. Incompatibility between the installed version of GRUB and the computer's firmware (BIOS/UEFI). 4. Overwriting of GRUB by another operating system installation, particularly if the new OS installer didn't detect existing bootloaders. 5. Issues with the partition table or file system, causing GRUB to fail in locating the necessary data for booting. 6. Incorrect boot order in the BIOS/UEFI settings, preventing GRUB from being loaded at startup. To resolve these issues, you may need to repair GRUB using a live Linux distribution, update the GRUB configuration file, restore the MBR (Master Boot Record), or even reinstall GRUB altogether, depending on the specific error and its cause.

• Improper configuration of GRUB
• Incorrect installation location of GRUB
• Accidental deletion of GRUB
• Corruption of the Master Boot Record (MBR)

How to Resolve GRUB Loading Errors 15, 17, 21, 22

The solutions vary depending on the error you encounter. Please specify the error message you receive and implement the corresponding resolution method.

Resolve GRUB Boot Loader Error 15

Ensure the kernel exists. To find out the exact kernel name, boot from the Live CD, and mount /boot depending on your partition, then execute the following commands: ``` cd /boot ls ```

Fix GRUB Loading Error 17

Make sure your root (x,y) settings are correct in your Grub.conf. You could use a distribution CD or Live CD to set up Grub as shown below. (h0,0) indicates the first hard drive and the first partition on that drive.

"sudo grub" translates to "sudo grub" in English.

This command translates to "root (hd0,0)" in English, which is a command used in the Linux/GRUB environment to specify the root file system partition. It refers to the first hard disk (hd0) and the first primary partition (0) on that disk.

setup (hd0) exit

Resolve GRUB Boot Loader Error 21

Step 1. Boot the computer from the Ubuntu installation CD.

Step 2. Run Command Prompt as an administrator.

Step 3. Enter the following command:

$ sudo -s
# grub
grub> find /boot/grub/stage1 (this command should return something like "hd0,0")
grub> root (hd0,0)
grub> setup (hd0)
grub> quit

Resolve GRUB Boot Loader Error 22

Step 1. Restart your computer and press "F8" continuously until you see the options menu.

Step 2. Return to the menu where you can select the operating system.

Step 3. Select "Microsoft Windows Recovery Console." (You may need your Windows installation disc to access the Recovery Console.)

Step 4. If prompted to select the system drive, type the number in front of the system drive listed.

Step 5. Type the account password when prompted. Run the command fixmbr and type "y" to confirm the operation.

Step 6. Type "exit," then restart your computer.

How to Recover Data Lost After Fixing GRUB Loading Error

Applies to: Restore all lost files and data after resolving the GRUB boot loader error in Windows 10/8/7.

Applying a specific fix for a GRUB loading error in Windows may result in data loss. Certain procedures might involve formatting the disk partition or erasing hard drive contents. Hence, it is crucial to know how to recover data after resolving the GRUB loading error on your computer.

Trustworthy Data Recovery Wizard Tools - Data Recovery Wizard Tools specialize in file recovery across all Windows operating systems. It enables you to effectively recover lost data due to GRUB loading errors with just a few straightforward clicks.

Discover how to effortlessly recover accidentally deleted or formatted hard disk data while resolving the GRUB loading error on your computer:

Step 1. Launch the Data Recovery Wizard tool. Select the drive where you lost your files and initiate the scanning process. This software enables you to recover lost data from various devices, such as HDD, SSD, USB drives, SD cards, pen drives, cameras, and so on.

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Step 2. Browse the full scan results. You can select the file type you need by clicking on the file type filter. The data recovery software supports over 1000 file types, including photos, videos, documents, emails, audio files, and many more.

Step 3. Select the files you wish to preview. Click "Recover" and specify a storage location to save the retrieved data.

Moreover, this data recovery software can also be used to retrieve lost files and data from desktops, laptops, internal hard drives, external hard drives, removable USB flash drives, pen drives, memory cards, and numerous other storage devices.

Bottom line.

GRUB loading errors typically occur on computers with dual operating systems, and each error code is significant as it points to a potential cause. To address the issue, implement the suggested solutions, and in case of data loss, utilize the Data Recovery Wizard tool to recover your data.