I found out that sometimes #OpenArena will not run by default under Ubuntu 20.04 and its derivatives (like #LinuxMint, Linux Lite, etc) despite a successful install via package manager.
This is how you can fix it and get fragging again:
https://tilde.town/~kzimmermann/articles/fixing_openarena_ubuntu.html
This is post 30 (yay, big three-oh!) of 100 in my #100DaysToOffload project.
@kzimmermann what's the ... part of the error message?
@meena good point, that's probably helpful for those searching. I've included the rest of the error message in the post.
@kzimmermann ah, there we go
undefined symbol: __atan2_finite
sounds like a mismatch in expectations on libc/libm
@meena yup, recompiling these libs seems to do the trick for now
@kzimmermann ...or you can "borrow" a copy of Quake III and play that with quake3e