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Modify /etc/group. Bost most Linux distros don't require you to be in the wheel group to su to root (it's a BSD thing, that can be activated on Linux but usually isn't). Judging by your errors, it looks like your su and sudo binaries don't have the SUID bit set. Can you do "ls -l /bin/su" and "ls -l /usr/bin/sudo"./ The permissions on each should be 4755 (note the leading 4, which enables the SUID bit), owner root, and group root.