I am experiencing this same issue, though I cannot use the workaround above as I am running my ubuntu 12.04 machine headless as a media server.
Using VNC to connect post logon does not allow me to choose a session at logon, hence setting the defaults via command line is the only option I have. (apart from getting vnc working at login screen which is pretty unreliable thus far!) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1036077 Title: LightDM refuses to respect changed default session for autologin To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1036077/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs