I want to use different password to logging into desktop from what I can use for sudo -s or sudo -s -u root on terminal/bash. And also I don't want any additional users with different desktops(like windows). And I also don't want this to use to be able to even browse system folders and should only be able to play media and browse internet. Is there a way I can do this?
I am using Ubuntu 20.04.1 with GNOME 3.36.4.