sudoers in ubuntu

For linux beginner like me i found it is kinda hard when working on a non-gui enviroment. I've created a new user in my ubuntu box for mail-archiva. When i try to sudo and it return with the error message "not in sudoers list".  It does give me a headache to switch account back and forth.

Here are the simple fix  (the text in bold is command line) :-

1) groups  <username> ; to check the group that the user account are currently associated with.

2) sudo adduser  <username> sudo ; to add the new user to the sudo group 

that should do the trick :)