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How To Fix Kernel Panic VFS Error in Kubuntu

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In the world of Linux, encountering errors is not uncommon. One such error that users might face is the Kernel Panic VFS error. This error can halt your system, making it inoperable until the issue is resolved. This article will guide you through the steps to fix the Kernel Panic VFS error in Kubuntu.

Quick Answer

To fix the Kernel Panic VFS error in Kubuntu, you can try updating the initramfs and grub, checking for available disk space, reinstalling the kernel, or enabling debug mode to gather more information about the error. However, please exercise caution when making changes to system files or reinstalling the kernel, as these steps can potentially break your system if not done correctly.

Understanding Kernel Panic VFS Error

Kernel Panic is a type of error that occurs when the Linux kernel encounters an issue it cannot recover from. The VFS (Virtual File System) is a software layer in the kernel that provides a common interface for file systems. The error “Kernel Panic: VFS: Unable to mount root fs on unknown-block(0,0)” indicates that the kernel is unable to access the root file system.

Causes of Kernel Panic VFS Error

This error can be caused by several reasons such as incorrect boot parameters, issues with the initramfs, or problems with the root file system. It can also occur if the system runs out of disk space.

Fixing Kernel Panic VFS Error

1. Update initramfs and grub

The initramfs is a temporary root file system used during the boot process. The grub is the bootloader for Linux. Updating these can often resolve the issue.

Open a terminal and run the following command:

sudo update-initramfs -u -k $(uname -r)

This command updates the initramfs for the currently running kernel ($(uname -r) returns the current kernel version). The -u option tells the command to update the existing initramfs.

After updating the initramfs, update the grub by running:

sudo update-grub

This command updates the grub bootloader configuration.

2. Check for Available Disk Space

If your boot partition is full, you might encounter the “No space left on device” error. Check the available disk space using the df command:

df -h

The -h option displays the disk space in a human-readable format. If the boot partition is full, consider removing unnecessary files or increasing the partition size.

3. Reinstall the Kernel

If the above solutions do not fix the issue, you might need to reinstall the kernel. Be cautious while doing this, as it can potentially break your system if not done correctly.

4. Debug the Kernel Panic

If you are still experiencing the Kernel Panic error, enabling debug mode can provide more information about the cause.

Open the /etc/default/grub file as root using a text editor:

sudo nano /etc/default/grub

Change the line GRUB_CMDLINE_LINUX_DEFAULT="splash quiet" to GRUB_CMDLINE_LINUX_DEFAULT="nosplash debug --verbose".

This change disables the splash screen and enables verbose debug output during boot.

Save the file and update the grub:

sudo update-grub

Restart your computer and observe the messages displayed during boot. Look for any errors or warnings that occur just before the kernel panic.


Fixing the Kernel Panic VFS error in Kubuntu involves understanding the root cause of the issue and applying the appropriate solution. The steps outlined in this article should help you resolve the issue, but remember to exercise caution, especially when modifying system files or reinstalling the kernel. If you are unsure about any step, seek help from a knowledgeable source or refer to the official Kubuntu documentation for more information.

What is Kubuntu?

Kubuntu is a Linux distribution that is based on Ubuntu but uses the KDE Plasma desktop environment instead of the default GNOME desktop environment.

How do I open a terminal in Kubuntu?

To open a terminal in Kubuntu, you can press Ctrl + Alt + T on your keyboard. Alternatively, you can search for "Terminal" in the application launcher and click on the Terminal icon.

Can I fix the Kernel Panic VFS error without reinstalling the kernel?

Yes, in many cases, you can fix the Kernel Panic VFS error without reinstalling the kernel. The steps mentioned in the article, such as updating the initramfs and grub, checking for available disk space, or debugging the kernel panic, can often resolve the issue without the need for kernel reinstallation.

How can I increase the size of the boot partition in Kubuntu?

Increasing the size of the boot partition in Kubuntu involves resizing the partition using a partition management tool. You can use tools like GParted, which is available in the Kubuntu software repository, to resize the partition. However, it is recommended to backup your data before performing any partition resizing operations to avoid data loss.

How can I revert back to the default grub configuration?

To revert back to the default grub configuration in Kubuntu, open the /etc/default/grub file as root using a text editor. Change the line GRUB_CMDLINE_LINUX_DEFAULT="nosplash debug --verbose" back to GRUB_CMDLINE_LINUX_DEFAULT="splash quiet". Save the file and update the grub using the sudo update-grub command. Restart your computer for the changes to take effect.

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