I'm experiencing a very annoying problem on Ubuntu 18.04.
Whenever my laptop resumes after being suspended I'm completely unable to login and get the error;
Authentication Failure Switch to greeter
The issue is well described here, although it seems no one has found a solution to it.
Is there any way to stop this from happening?
To anyone who comes across this, the shortcut to get to the greeter without having to reboot is Ctrl-Alt-F1.
Also if anyone of the people who voted to close this question had actually read the bug report above they'd see that users still report the same issue after upgrading to 18.04.