The main issues that I've found while trying to run the mod on Ubuntu 20.04(LTS) :

1)Portraits in the nation selection screen wont work;
2)Some nations research simply wont work, can count 2 or 3 but the rest the every time that i would select a slot would reopen the slot selection screen;
3)Galactic Market, Senate and Loan buttons wont appear as well;
4)With some nations the focus tree would be completely broken e due to the continuous focus simply being on top of half the focus.
5)Models in general aren't working, templates, icons on production lines and deployed units.
6)In game portraits sometimes would work and sometimes not.

If there’s a way to manually install the files let me know, great fan of that galaxy far away.

I have great faith in this mod, needing a guy to test on linux, just send me message!

May the potatoes be with you!