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. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1641055 Title: startx, lightdm fail to start To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1641055/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp