Add or remove users from sudo group - Ubuntu

If you want to add or remove users from the sudo group on Ubuntu, you can follow the below examples,

Add user to Sudo Group

% sudo adduser c2c sudo

Adding user `c2c' to group `sudo' ...
Adding user c2c to group sudo

Done.

If the user already exists in the sudo group make use of sudo adduser command,

% sudo adduser c2c sudo

The user `c2c' is already a member of `sudo'.

Remove user to Sudo Group

In order to remove a user from sudo group you can make use of sudo deluser command,

% sudo deluser c2c sudo

Removing user `c2c' from group `sudo' ...

Done.

bash|/usr/sbin/deluser: The user `c2c' is not a member of group `sudo'.