Comment 19 for bug 1785715

I did that and rebooted.
After i selected ubuntu in grub menu as usual i got the normal login screen. After logging in i only see a violet background and a mouse pointer. Hitting keys and moving mouse does nothing, but when i switch to TTY4 via ALT+f4 i can see a warning:
[ 368.068010] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:1:61]

this warning is repeated every 28 seconds

And it seems i cannot log in via tty anymore :/

It feels like this is a completely different problem.

What i can do is enter recovery mode and get a root shell.