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
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/dev/null permission
https://launchpad.net/bugs/58509
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