[ubuntu] root and right problem.

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http://ubuntuforums.org – Somehow my system setup changed. I was copying DVD's yesterday with Brasero Disk Burner. Now I can not for one or other dark reason see my DVD any more or change the rights of the users. I still can see the DVD player under Guest. Besides that when I try to log in via Terminal I get this message: jan@jan-desktop:~$ sudo -i sudo: /etc/sudoers is owned by uid 1000, should be 0 sudo: no valid sudoers sources found, quitting jan@jan-desktop:~$ Regards PS I did an upgrade today with "Update manager". (Hardware)