It seems lightdm tries to open the new session at vt7 (where the orignal xsession is already running) instead of a vt8 (or whatever is unused). It partially succeeds, resulting is this weird state, where parts of both, original xsession and lightdm, are displayed and input is shared.
** Attachment added: "Xorg.1.log" https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1248948/+attachment/3903211/+files/Xorg.1.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1248948 Title: lightdm gets confused after multiple login/logouts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1248948/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
