Fix GRUB Loading Error 15, 17, 21, 22 and Recover Data

What Is GRUB

GRUB (Grand Unified Bootloader) is a boot loader that allows users to choose which operating system to boot from on a multi-OS computer, providing a choice between Windows and Linux installations.

Common GRUB loading errors and their solutions include: "GRUB cannot find the device for the root filesystem" can be resolved by checking the GRUB configuration file for the correct device name; "GRUB cannot read the filesystem" can be fixed by checking the filesystem integrity and running fsck if necessary; "GRUB cannot load the kernel" can be solved by checking the kernel version and ensuring it matches the version listed in the GRUB configuration file; "GRUB cannot load the initramfs" can be resolved by checking the initramfs version and ensuring it matches the version listed in the GRUB configuration file; and "GRUB cannot find the device for the root filesystem" can be resolved by checking the GRUB configuration file for the correct device name. By identifying and addressing these common GRUB loading errors, users can resolve issues and ensure a successful GRUB loading process.

Common GRUB Loading Errors

However, it's not without a problem while using GRUB. Many users have the experience of encountering the GRUB loading error during the computer startup, particularly when using Stage 1.5 or Stage 2.0, resulting in errors 15, 17, 21, or 22.

GRUB loading error 15

This error is displayed when the specified file name cannot be found.

GRUB loading error 17

The "Cannot mount selected partition" error occurs when GRUB fails to recognize the file system type of a partition, even though the partition itself exists. This prevents GRUB from mounting the partition, leading to the error message.

GRUB loading error 21

The error "The selected disk does not exist" occurs when the disk is not recognized by the system's BIOS, meaning it's not detected or acknowledged as a valid storage device.

GRUB loading error 22

This error occurs when a requested partition is not found on the selected disk.

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

When installing Windows and Linux on a computer, configuring GRUB correctly is essential to boot from one of the operating systems successfully. However, users may encounter GRUB loading errors, such as error 15, 17, 21, and 22, which can be caused by various factors.

• Improper configuration of GRUB
• The wrong installation location of GRUB
• Accidental deletion of GRUB
• The corruption of MBR

How to Fix GRUB Loading Error 15, 17, 21, 22

To resolve the issue, identify the specific error message you're encountering and follow the corresponding solution. Each error has a unique solution, so specifying the exact error message will help determine the correct course of action. Once you've identified the error, you can proceed with the solution to resolve the issue.

Fix GRUB Loading Error 15

Make sure the kernel exists. To find out what the exact kernel name is, boot from the Live CD, and mount /boot depending on your partition. Then, navigate to the /boot directory and list the contents using the command "cd /boot | ls".

Fix GRUB Loading Error 17

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

sudo grub

root (hd0,0)

setup (hd0) exit

Fix GRUB Loading Error 21

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

Step 2. Run Command Prompt as an administrator.

Step 3. Enter the following command:

Fix GRUB Loading Error 22

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

Step 2. To go back to the menu where you can choose the operating system, you can press the "Esc" key. This will bring you back to the previous menu where you can select the operating system you want to install.

Step 3. To access the Microsoft Windows Recovery Console, select it from the list of options provided. Note that having a Windows installation disc may be necessary to access the recovery console.

Step 4. If you are asked to choose the system drive, enter the number in front of the system drive listed.

Step 5. Enter the account password as required, then run the command "fixmbr" and confirm the operation by entering "y".

Step 6. Enter "exit" and restart the computer.

How to Recover Data Lost After Fixing GRUB Loading Error

To resolve the GRUB loading error in Windows 10/8/7 and restore all lost files and data, you can try the following steps: First, boot your computer from a live USB or CD with a Linux distribution, such as Ubuntu. From there, you can access your Windows partition and recover your lost files and data using tools like TestDisk or PhotoRec.

Applying a fix for a specific grub loading error in Windows may cause data loss, potentially formatting disk partitions or deleting hard drive contents, making it essential to learn how to recover data after resolving the grub loading error on your computer.

Deep Data Recovery is a software that specializes in file recovery on all Windows operating systems, allowing users to recover data lost due to the GRUB loading error with ease.

• Free Download
• Windows 11/10/8/7, 100% Secure

You can recover accidentally deleted or formatted hard disk data while fixing GRUB loading errors on your computer with ease. To do this, you can use data recovery software to scan the affected hard drive and retrieve lost files.

Note: To increase the chances of successful data recovery, install Qiling data recovery software on a different disk from the one where the files were lost.

Step 1. Launch Deep Data Recovery on your Windows computer, select the desired file types, and click "Next" to begin the recovery process.

Step 2. Select the disk partition or storage location where you lost data and click "Scan" to begin the recovery process.

Step 3. After starting the recovery software, it will begin scanning the disk to locate all lost and deleted files. Once the scan is complete, users can proceed to filter the results by selecting "Filter" and then "Type" to specify the types of lost files they wish to recover.

Step 4.With this tool, you can preview and restore lost Windows files. Simply double-click to view the scanned files, select the desired data, and click the "Recover" button to save them to a safe location, such as another folder on your PC or an external storage device.

This data recovery software can be used to recover lost files and data from various storage devices, including desktops, laptops, internal hard drives, external hard drives, USB flash drives, memory cards, and more.

The Bottom Line

GRUB loading errors on dual OS computers can be resolved by applying the suggested solutions, and in case of data loss, Deep Data Recovery can be used to retrieve the data.

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