I think what becomes clear when watching a lot of videos is that Linus is more of a tech fanboy that is good at all the high level stuff and can sell it in an entertaining way. He is not however someone who is super into the weeds of a specific technology, tool or system beyond applying his „I’ve worked with technology before“ knowledge.
They have other folks on the show for that.
It that being said. I wouldn’t fault him for his experience with PopOS!. That was totally on the OS and not his fault.
I’ve been told that Artemis Fowl in the books is actually a nice and smart person. In the movie he comes across as an arrogant dick for a larger part.