Killing off gnome-screensaver, then making this symlink fixed it. I think there is an error in the last update.
* debian/patches/05_gdm_varrun_fix.patch: - look for the gdm socket to /tmp/.gdm_socket and then /var/run/gdm_socket This should be /var/run/.gdm_socket and not /var/run/gdm_socket Quick symlink hack to fix the issue: sudo ln -s /var/run/.gdm_socket /var/run/gdm_socket -- screen does not unlock after locking https://launchpad.net/bugs/76632 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs