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-X, which is subscribed to xorg-server in ubuntu. _______________________________________________ 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