Same issue, sometimes, with Ubuntu 18.10
switching user isn working
workarround is to switch to another console (ctr-alt-F1) after loggin in get my 
session back
if it occours, itÅ› every time the screen locks also with the lock-screen button

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https://bugs.launchpad.net/bugs/1733557

Title:
  Login screen showing Authentication Failure Switch to greeter...

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