Done. Please find attached the terminal output. Incidentally, I made a new install on another partition, this time from the release version of 11.10, and on that I can open a guest session without a problem (just to be clear, the terminal output is from the old install).
** Attachment added: "Terminal Output" https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/870373/+attachment/2561843/+files/Terminal%20Output -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/870373 Title: guest session will not open To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/870373/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs