Greetings -- I (and all other admin group members) can no longer run sudo on Ubuntu Server 10.04 LTS as we receive the following group ID error:

"/etc/sudoers is owned by gid 113, should be 0"

How can we replace the file sudoers with one with correct permissions? A quick search suggests that recovery mode is the only way, though I'd need to convey appropriate instructions to my IT people as I don't have physical access to the (virtual) server and have no idea how it's done in Ubuntu Server.

Many thanks,