I’ve been unable to get Gnome to work at all, and I’ve been unable to get KDE to be stable with any prebuilt repositories including those that Zorin includes.

     So now I am attempting to build KDE from source, and in the attempt found that qt5 is largely broken so I’ve had to backup and now am working on building qt5 from source.  This is turning into more work than I want and I may decide to ditch Zorin as just a too immature and broken operating system to be worth supporting.