Hi. I also have this problem on my DELL Optiplex AIO 9010 running Ubuntu 
16.04.5 LTS.
 
And "Yes I know that 16.04 is no longer supported" ... however it seems that if 
you upgrade to 18.04, it does not solve the problem and in fact makes it worse 
!! At the moment, I get this message after my desktop has been sleeping, click 
on it and the usual login prompt appears whereas with 18.04 it seems that we 
cannot switch to the login screen without pressing CTRL-ALT-F1.

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

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

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