How to roll back to an earlier kernel?

[TwoFistedJustice]

I need to roll the kernel back on a Kubuntu machine because it won't boot from the latest one it has. It will boot from earlier ones.

How to roll it back?

[claydoh]

Select it at the grub menu?
Which Kubuntu release? Which kernel do you want, and which is the bad one?


grub customizer is probably the best tool for setting which item to boot by default, but if you are on 24.04 LTS, and the good kernel is 6.8.x, and the bad kernel is 6.11.x, there are other options which will prevent the 'bad' kernels from even being installed/updated.

[TwoFistedJustice]

After way too much not figuring it out I figured it out! Really I got lucky. I couldn't download a new kernel from sources. So I ran

sudo dpkg --configure -a

And while watching the scroll I saw it generating new Linux images and such. So I tried rebooting into the "bad" kernel. It worked!

The error I was getting was:

“Kernel Panic – Not Syncing: VFS: Unable to Mount Root fs on unknown-block.”

Note, I only had 3 kernels installed.

[TwoFistedJustice]

Well I fixed it by sheer dumb luck and a little paying attention - see previous post.

This is the first I've heard of grub customizer. But looks a ton better than the way I have done it in the past. Will check it out. Thank you claydoh !

Select it at the grub menu?
Which Kubuntu release? Which kernel do you want, and which is the bad one?


grub customizer is probably the best tool for setting which item to boot by default, but if you are on 24.04 LTS, and the good kernel is 6.8.x, and the bad kernel is 6.11.x, there are other options which will prevent the 'bad' kernels from even being installed/updated.