Press the escape key when booting
And how do I make sure that on every boot I boot with the old kernel?
i would remove the newer on when you booted in the older kernel. Use synaptic to do so and use the search function to find kernel-headers.
If you want to do it manually you can follow this guide.
Ok. And what if the software updater updates the kernel automatically? Should I do the whole process again?
Ok. I'll check it.
One more question: How do I know when should I upgrade to the new kernel? Just switch to a new kernel after a while?
I switched to old kernel from GRUB and removed the newer kernels, but still after reboot uname -r shows newer kernel being used. What do I do?
how did you remove them ? with synaptic ?
in terminal what is the output ?
sudo dpkg --list | egrep -i --color 'linux-image|linux-headers|linux-modules'
I removed them with synaptic(complete removal).
This may be of interest, re lock kernel via Synaptic: Zorin OS Update After Sept 6 '21 kernel 5.11.0-34 Black Screen - #37 by Aravisian
You will have to ask @FrenchPress to translate the Japanese screenshot though
Yes, I locked the latest version of kernels after removal.
Did you remove:
headers
Image
Modules?
Search synaptic for the Kernel version number you wish to remove.
For example, let's say you want to remove 5.11.0-37:
linux 5.11.0-37
That should show the packages - and any that are marked as installed.
Oops. I just removed headers. Ok. I'll now remove the other two too.
Okay. I booted to an old kernel from GRUB. Removed headers, image, and modules using sudo apt remove --purge linux-*-5.11.0-37*
Then opened synaptic and have put a hold on linux kernel 5.11.37 and rebooted my laptop.
Now I am using 5.11.27 kernel and everything is good!!
The apt-mark hold
command must be used on the kernel, not the version.
Try:
sudo apt-mark hold linux-image-generic linux-headers-generic
Okay. Will do it now.
This will prevent kernel updates entirely?
Yes. It will lock the kernel in, preventing upgrading the kernel from software updates. Very useful when a later kernel has a regression.
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