I have the same type problems with my 78 yr old father in law. He manages to mess up things a lot as he explores the computer. Then I get to figure out what he did.
I put cinnamon desktop on, and the hot corner caused him a lot of grief.
He would shoot the mouse to the top left and then you get the workplace selector, then he clicked the plus button on right so many times all the added workplaces receded until they become grey goo. He was unable to then use the pc for a full day as he did not know to put the mouse back to the hot corner to show a desktop.
I did find a way to disable the hot corner on a mint forum.
He also deletes a lot of stuff, then claims it was never there.
So even not involving sudo privileges, he messes up how it works.
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