I've installed unityhub 2.1.0 from AUR, and am running 2019.2.2f1.
Only problem is that when trying to slice sprites, I can't change the slicing option which would make tileset slicing nearly impossible.
I think it's something to do with how menus work in KDE Plasma.
(Also, I typically disable KDE Global Menu when using Unity as options are greyed out and this problem still occurs.)
Any help is appreciated, best!