I’d say wipe and reinstall again, but this time with a different Distro and user password, just to eliminate a bunch of variables at once, including suspect install media.
Try Fedora this time. It usually gets the latest security patches in its repos quite quickly, and it has spins for all the myriad desktop environments out there.
Now the big question is: can this be used as case law against future attempts by Nintendo to stomp on fair use and other parody works?