Same issue in my laptop Lenovo G40-80 I think after some apt-get
update/upgrade it has started. (Between 2 or 3 weeks ago)

I'm the only user of this computer. There is only my user and admin is disabled.
I use Virtual Box and it was upgraded recently to Version 5.1.34 r121010 
(Qt5.5.1).

If I lock screen it don't happens immediately. It happens only after screen 
goes blank.
Then I have to click on "switch to greeter" in password field and wait some 
seconds to screen changes and I be able to insert password.

# lsb_release -a
LSB Version:    
core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:printing-9.20160110ubuntu0.2-amd64:printing-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.4 LTS
Release:        16.04
Codename:       xenial

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

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

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