I'm having trouble giving a user sudo access. I have Ubuntu 12.04 LTS on my new VPS.
I made a user named portaljacker, added it to the admin group, and admin group is in the sudoers file as
%admin ALL=(ALL) ALL
yet when I use sudo as portaljacker it says:
sudo: must be setuid root
I have no idea what's wrong since I did this a while ago on a previous VPS (not accessible, long story) and can't remember what I did differently.