I recently did the automatic upgrade from 12.04 to 14.04, but I can't log in to my Ubuntu boot anymore.

I get a dark blue/black screen after the Ubuntu loading screen. If I move the mouse, I can see it, but no screen loads. I am able to ctrl-alt-f1 and get a login screen, and from there can do 'sudo service light-dm start'. This will get me a login screen, but when I go to log in, it will take me back to the login screen over and over.

I reinstalled fglrx several times, as well as ubuntu-desktop. The logs all look fine. I also regenerated xorg.conf.

The only thing I see wrong is that fglxrinfo returns Error: unable to open display (null) instead of what it's supposed to return.

Any idea what is causing this error, and how to fix my GUI?

Edit: I noticed that sometimes when go over to ctrl-alt-f1, it's hung up on either mysql or it just finished loading "networking." I'll check the network log next.

  • Did you actually upgrade all the way to 14.10, or do you mean 14.04? Sep 22, 2014 at 3:43
  • What tool or command did you use to do the upgrade? Sep 22, 2014 at 3:49
  • @eliahkagan yea, sorry. I'll fix it when I get to a computer.
    – JFA
    Sep 22, 2014 at 14:25
  • @neon_overload a window popped up asking if I wanted to upgrade and I said yes.
    – JFA
    Sep 22, 2014 at 14:26
  • @JFA this will help for sure : askubuntu.com/questions/223501/… Sep 23, 2014 at 5:34

1 Answer 1


i had a similar issue and the problem was the permission with the file ~/.Xauthority so i took backup and deleted it and rebooted this solved my login issue

  • That didn't seem to work, and I can't even launch the login screen now with start lightdm
    – JFA
    Sep 22, 2014 at 14:24
  • This is the solutions i used for my issue askubuntu.com/questions/223501/…
    – Fat Mind
    Sep 23, 2014 at 10:46

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