Same for me after reboot. Before this reboot my x-server crashed and I modified my xorg.conf by changing gpu-driver from nvidia to nv.
** Attachment added: "And the report." http://librarian.launchpad.net/5567357/_usr_bin_clear_console.1000.crash -- Crash on "clear_console" https://launchpad.net/bugs/57413 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
