kernel fallback to older version - Ubuntu

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Kernel upgrade is a simple and smooth process. However, there are a few cases for which all ways need a fallback kernel available.

NOTE:  Test changes first in using #1 before making the permanent changes to the system. 

Temporary: Boot into the previous version of Kernel:

Interrupting the boot process using ESC key keep will splash the available kernel version on the system. Select the kernel. 


2) Permanent 

Method 1:

  1. sudo view /boot/grub/grub.cfg and copy the full name of your old kernel.
  2. sudo vi /etc/default/grub and, at the top, change GRUB_DEFAULT=0 to instead read GRUB_DEFAULT=your_kernel_name_from_grub.cfg, and save the change (you may like to keep a copy of the original file for safety).
  3. sudo update-grub
Method 2:
      1. grep -A100 submenu  /boot/grub/grub.cfg |grep menuentry
      2. update GRUB_DEFAULT=gnulinux-advanced-version>gnukernl-kernel-version in /etc/default/grub
      3. sudo update-grub

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