"sudo" will normally report an error message about the binary or the
configuration file  having the wrong permissions if that is the issue.
It will also report a different error message if the user is not allowed
to execute the requested command.

"sudo" throws away its root user status when it reads from files (and
relies upon root group membership to do the disk I/O -- it actually does
the request as the daemon user :).  So, something is probably wrong that
means the "sudo" program can't read /etc/sudoers once its thrown away
its root *user* privs...

I would check the file permissions on / and on /etc using the command
"ls -lad / /etc" and make sure there aren't any ACLs or extended
attributes in the way...

Post back if you don't work it out from there...

-- 
sudo with tar crashes /etc/sudoers
https://bugs.launchpad.net/bugs/72552
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