Kernel 5.4 fails at boot with this message after update.
I tried reinstalling the kernel and modules but it did not help. Other kernels work.
What could be the problem?
Thank you.
Probably this… 
I would however advise you to use a more recent LTS kernel, such as 6.1. It’s probably less of a hassle. 
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Thanks for replying!
I chrooted and opened the /etc/default/grub file, then changed the GRUB_CMDLINE_LINUX_DEFAULT line to exactly this:
GRUB_CMDLINE_LINUX_DEFAULT="XXXXXXXXXXX SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 systemd.unified_cgroup_hierarchy=0"
Do I need to replace the XXXXXXXXXXX part with something else?
I saved it and then tried sudo grub-install && sudo update-grub and I got this:
In the beginning it shows “grub-install: error: cannot find EFI directory” to which I responded with ‘mount dev/sdb1 /boot/efi/’.
It did not work.
Any ideas?
Yes, with nothing … ie you should delete it as it probably caused an error. You just needed to add the SYSTEMD_CGROUP... to the existing content, if any.
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Comment in title
Failed to start…everything
does not seem consistent with comment:
If other kernels are working, solution has already been suggested
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Newer kernels give me terrible sound issues, that’s why I am stuck with 5.4. (I have posted here about the audio issues but there was no solution found.)
Friday I willl try to do it how @Denis_Pom suggested.
@MeuKey for me what worked for now is a Timeshift restore and newer Kernels.
thanks for reply, it seems upgrade the kernel resolve the issue
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