Before being presented with the actual login screen, I am presented with another additional login screen.

What is this second login screen?

Actual login screen:

enter image description here

Additional login screen:

enter image description here

Related bug report is #1577110.

  • 2
    Try removing your .Xauthority. Go to a TTY (Ctrl+Alt+F1) and type mv .Xauthority .Xauthority_2016-07-02. Then run sudo service lightdm restart and see if it fixes the issue.
    – anonymous2
    Jul 2 '16 at 18:40
  • 3
    And BTW, the additional isn't technically a login screen; it's an unlock screen.
    – anonymous2
    Jul 2 '16 at 18:41
  • You could also run chown -R user:user ~/.dbus, replacing user with your username.
    – anonymous2
    Jul 2 '16 at 18:42
  • I also had this second unlock screen once after Unity crashed and kicked me out of my session.
    – Byte Commander
    Jul 2 '16 at 21:09
  • @anonymous2: Let the user's environment tell you what the ownership should be: sudo chown -R $(id -u):$(id -g) ~/.dbus (and use sudo to insist on the ownership change).
    – waltinator
    Jul 3 '16 at 2:32

Remove your .Xauthority.

mv .Xauthority .Xauthority_2016-07-03
sudo service lightdm restart

You could also try just changing it's ownership:

sudo chown user:user .Xauthority
sudo service lightdm restart

...replacing user with your username.

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