root can't sudo

[T o n g <mlist4suntong@yahoo.com>]

Hi,

I had no problem invoking my scripts embedded with sudo as root before, 
but not now in my new installation:

root@coral:~# echo abc | sudo tee /tmp/t
sudo: can't open /etc/sudoers: Permission denied
sudo: no valid sudoers sources found, quitting

root@coral:~# id
uid=0(root) gid=0(root) groups=0(root)

root@coral:~# ls -l /etc/sudoers
-r--r----- 1 root root 2354 2010-09-17 09:34 /etc/sudoers

root@coral:~# head -1 /etc/sudoers
# sudoers file.

What could be wrong?

Thanks

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