Let us look at the procedure in detail. We will also take a look at how to add or remove Users from a Group. To add or remove Users from a Group: Open the Groups folder Select the Group Double ...
It displays all the users you can add for using the Remote Desktop on your computer. For your information, you can find Administrator, ALL APPLICATION PACKAGES, ANONYMOUS LOGON, CREATOR GROUP ...
To add your user to the admin group, you would issue the command (as a user who already has full sudo privileges): sudo usermod -a -G sudo USERNAME Where USERNAME is the name of the user to be added.