I think this bug should relate to lightDM, after I switched to gdm, this bug gone and everything works fine.
And I have nvidia GTX460 video card with P67 motherboard(ASUS M4E) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/874218 Title: LightDM restarts after first login attempt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/874218/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs