First time posting, I just wanted to throw this out there that with Kernel 5.6 I had kernel panic and could not solve using this solution: Kernel Panic After Update
The way I fixed it was booting into Kernel 5.5 and using the gui grub modifier (grub-customizer) and I actually had to remove 5.6 as an option as well as modify the main option. Once I updated and such I didn’t even get 5.6 as an option so maybe it was a bad time to update when I first had that issue.
Afterwards I was able to boot up like normal and update etc. I hope this helps someone!