I had this problem today where lightDM wouldn't let me login after I ran apt-get upgrade so I installed aptitude and ran the upgrade. Fixed the issue.
Is this the same issue? If not, I will delete my comment. Just trying to help. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-lts-quantal in Ubuntu. https://bugs.launchpad.net/bugs/1134492 Title: xserver-xorg-lts-quantal breaks Kubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1134492/+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