I've experienced that when switching to lxdm as well. I think this is a bug in gdm though, that doesn't respect the default login manager chosen, and starts unconditionally.
** Changed in: lxdm (Ubuntu) Status: New => Confirmed -- lxdm selected causes gdm and lxdm both to run https://bugs.launchpad.net/bugs/579538 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