Ok, assuming you've undone the damage to /lib/udev/devices/null, could you please reboot your machine until you have a /dev/null with only 0600 permissions.
Could you note whether it takes any longer to boot than usual? >From that boot, please attach /var/log/udev Also please run "udevtest /class/mem/null" ** Changed in: udev (Ubuntu) Importance: Undecided => High Assignee: (unassigned) => Scott James Remnant Status: Confirmed => Needs Info -- /dev/null permission https://launchpad.net/bugs/58509 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs