This article covers how to add a user to sudoers using different methods, limit root access with sudo and remove a user from sudoers.
Sudo is a very handy tool for system administrators that allow them to provide root access to a user with granularity.
Steps to Add Sudo User on Ubuntu ?
1. Log into the system with a root user or an account with sudo privileges.
2. Open a terminal window and add a new user with the command:
# adduser newuser
The adduser command creates a new user, plus a group and home directory for that user.
You may get an error message that you have insufficient privileges. (This typically only happens for non-root users.) Get around it by entering:
# sudo adduser newuser
3. You can replace newuser with any username you wish. The system will add the new user; then prompt you to enter a password. Enter a great secure password, then retype it to confirm.
To Add User to Sudo Group:
1. In a terminal, enter the command:
# usermod -aG sudo newuser
Replace newuser with the username that you entered in Step 1.
Again, if you get an error, run the command with sudo as follows:
# sudo usermod -aG sudo newuser
The -aG option tells the system to append the user to the specified group. (The -a option is only used with G).