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1. vim /etc/group
2. Could not find "admin" group
3. adm:x:4:MYUSERNAME << added it here, because I assume this is "admin"
4. quit the vim editor...and tried it under my username...and it DOESNT WORK!
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The "adm" group is not the same as the "admin" group.

Also, you should never edit /etc/group by hand. If you mess something up, you can end up with a broken system.

The easiest command for adding someone to a group is like this:

gpasswd -a MYUSERNAME admin

If you're trying to give someone sudo-rights, can also just run visudo as root, and add a line like this to the file:

MYUSERNAME ALL=(ALL) ALL

If you want to give sudo-rights to everyone in the "adm" group, you can do something like this 

%adm ALL=(ALL) ALL
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  • visudo, I ran that as root. bash: visudo: command not found
    – Alex
    Oct 8, 2009 at 20:17
  • What version of Ubuntu is this? I haven't heard of any Ubuntu versions that didn't ship with sudo… If you don't have sudo installed, try running apt-get install sudo.
    – mikl
    Oct 8, 2009 at 20:41

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