Well, if you can start a guest session, the problem probably lies somewhere in your user directory. I think we'd need to see a couple of log files:
cat ~/.xsession-errors sudo cat /var/log/lightdm/lightdm.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1366209 Title: Returned to the greeter screen when logging in. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1366209/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
