I didn't see errors while downloading, installation, or changing permissions, but when i try running MuseScore, I get the error "QStandardPaths: XDG_RUNTIME_DIR not set". My linux/ubuntu environment contains the line "XDG_RUNTIME_DIR=/run/user/1000", and the "ls $XDG_RUNTIME_DIR" variable resolves to a folder containing 11 files.
When the app's launched, it forks off a 2nd process that hangs, so I use System monitor to kill them (to free up resources. Have you seen this behavior before? Do you know how to resolve it? thanks, o2btrump-