/dev/null permissions changes on boot kubuntu 8.04.2

[kilometk]

/dev/null permissions changes on boot
I can't log on with graphical interface
when I tun my coputer on I got this
/dev/null: permission denied
/dev/null: permission denied
/dev/null: permission denied
Some program is changing the permission of /dev/null , leaving the permissions in this way
0600 which is -rw-r--r-- 1 root root 1, 3
and it needs to be
0666 which is crw-rw-rw- 1 root root 1, 3
I tried to remake it, removing it with rm /dev/null
and recreting it with mknod -m 0666 /dev/null c 1 3
and I check it with ls -l /dev/null
and everything is fine
but when I reboot the permission has changed
I seems to be a program with root permissions is changing it when I reboot

is there a way to know which program is changing the permissions of /dev/null?
or a way to solve this?

Note: this happend after update

[Rubberman]

This is a new one on me. /dev/null is a system pseudo-device and should not be diddled with. Have you looked on the Ubuntu web site forums for any other reports of this problem after a recent update?