After deleting the .Xauthority file, I can now successfully log into a
Unity session.
The problem seems to be gone (rebooting worked fine after this). Maybe
somebody can figure out how I got into this situation, but otherwise the
bug can be closed as far as I'm concerned.
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If I *remove* xserver-xorg-video-intel, lightdm is able to show me the
login screen. However, there is corruption on the screen and trying to
log into a Unity or Gnome session just shows a blank screen and then
puts me back into the login screen after 1 second.
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