What we should do if we accidentally deleted the Ubuntu kernel? Let’s see the recovery options with our Server Management Services at Bobcares.

Accidentally Deleted Kernel Ubuntu?

Ubuntu systems run the Ubuntu kernels provided by the Ubuntu repositories by default. Ubuntu should backup the system configurations every time an important configuration file is changed or a package is installed / upgraded and restore the system to the last known sane time upon request.

Most users who are curious about creating their own kernels do so because they have Ubuntu installed on their system and want to make a small modification to the kernel for that system. However, while doing so, we may inadvertently delete the system’s current kernel. In this article, we will look at how to resolve the problem.

We should follow the below steps:

• Boot from a live CD (or USB), mount some systems, chroot into them, and install the kernel. Unmount the filesystems after the kernel has been successfully installed.
• Now open the Terminal.
• Now use the command sudo mount /dev/sdXY /mnt to mount the Ubuntu partition.
• Also, mount some special partitions.

  sudo mount --bind /dev /mnt/dev
  sudo mount --bind /proc /mnt/proc
  sudo mount --bind /sys /mnt/sys

   
• Use the DNS servers from the Live environment when we are connected to a network (otherwise hostnames may not be resolved).

  cp /etc/resolv.conf /mnt/etc/resolv.conf

   
• Now Chroot into the /mnt: sudo chroot /mnt
• We can now install the Linux kernel using the command:

  apt-get install linux-image-generic
• After successfully installing the kernel, exit the chroot and unmount the following filesystems:

  exit
  sudo umount /mnt/sys
  sudo umount /mnt/proc
  sudo umount /mnt/dev
  sudo umount /mnt

   
• Finally, reboot and remove CD or USB using the command:

  sudo reboot

The process of restoring the Ubuntu kernel after accidentally deleting it is painful, but if we follow the above steps carefully, it will be beneficial.

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Conclusion

To conclude, our Support team provide the details of restoring the kernel when accidentally deleted the kernel Ubuntu.