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.