If you give a user sudo privileges how can I remove the sudo privileges and make the user become just a regular user?
sudo adduser username sudo
Now I've changed my mind.
If you're like me, you are just trying to figure out how to take away sudo access from a user. It's easy, just open sudo, and type the following in. Keep in mind that USERNAME can be replaced by the profile you are doing this to. In terminal type:
sudo deluser USERNAME sudo
This will only take sudo access away from the profile named USERNAME, and will not delete!