My crystal ball is not working currently, so I have to fall back on this archaic method of information aquisition, called "follow-up questions":
- Are you saying gimp-2.10 does not start? How are you trying this, what exactly is happening, is there some output you might want to share with us (try starting it from a terminal)?
- How did you (attempt to) install it in the first place? all the steps please, incl. links, commands issued, output received.