I have the same issue. According to the Xorg.0.log and Xorg.0.log.old files, my first X session was running on VT1 and my second one on VT7.
When I switch to VT1 after the second login, I can see what seems to be a unsuccesful attempt to log in : init: unreadahead-other main process (717) terminated with status 4 Ubuntu lucid (development branch) daedalus tty1 daedalus login: *** Password: Ubuntu lucid (development branch) daedalus tty1 daedalus login: -- Plymouth text-mode splash causes X to crash on first run due to shared tty7 https://bugs.launchpad.net/bugs/532047 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs