I'm having the same problem.. I think. Here is my description from StackExchange. http://askubuntu.com/questions/369579/why-is-my-system-freezing-when-i-switch-users
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/884331 Title: cannot switch user, lightdm seems to freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/884331/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
