Groups and sudo

[scott at MIT.EDU (Scott R Ehrlich)]

I have a Fedora Core 5 user who's user account is part of /etc/sudoers.   The
user changed all groups from group 'root' to group 'users'.   Now, even though
part of /etc/sudoers, his account has no admin rights to perform various
functions, such as adding printers, sudo, etc.  Immediate Insufficient perms.
I can, though, su directory from a terminal session.

He does not want to change the group ownership back to group 'root'.

How do I [re]grant root/sudo access to directories and files that have 'users'
group ownership?

Thanks.

Scott

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