Create a new user and add administrator permissions in ubuntu

1. Ctrl+Alt+T to open the terminal, enter sudo adduser ubuntu (ubuntu is the new user name I created), press Enter, enter the password, enter the password of the new user according to the prompts, and prompt to enter the information, just press Enter.
Add user: sudo adduser ubuntu


2. Enter sudo adduser ubuntu sudo, and give the new user the authority of the administrator.

3. Switch to the new user, Ctrl+Alt+T to open the terminal, enter sudo su to check whether the addition of administrator permissions is successful, as shown in the figure below.