God I hate Python
Just a guess, but I'd say Catfish has not been updated to Python3 yet. Try "python2 `which catfish`" and see what happens.
pretty it's been a python3 app for a while
>It's just that whenever something related to Python lands on my system(s) it's bound to crash and burn eventually
I checked Lauchpad. You're right. #Catfish file manager is a #Python3 app, seemingly packaged by Xubuntu for Debian and Ubuntu systems.