Failed to login even to terminal somehow enter is pressed

Question

I fail to even log into recovery terminal, after I roll back to 4.4.0-142-generic kernel (because of error in nvidia driver in 4.4.0-143-generic kernel) after grub update. I login and then somehow additional enter is pressed and voilà, I have brick instead of PC.

Answer 1

I solved this issue by pressing and and praying to select other option to boot. I succeed and ffter it select 440-142-generic kernel and boot with it

I set GRUB_DEFAULT='Advanced options for Ubuntu>Ubuntu, with Linux 4.4.0-140-generic' in /etc/default/grub file update-grub reboot