Musescore Flathub won't run

• May 28, 2021 - 18:46
Reported version
3.6
Type
Functional
Frequency
Once
Severity
S1 - Blocker
Reproducibility
Always
Status
closed
Regression
No
Workaround
No
Project
MuseScore

Steps to reproduce:

  1. Install Musescore from Flathub on my Linux Mint 20.1 system.
  2. Try to run it --> Nothing happens.

I've had Musescore installed via Flathub for a couple years, and it always worked until recently. I've tried uninstalling and reinstalling, but the results are the same.

Here are the results when I run it from my terminal:
~$ /usr/bin/flatpak run --branch=stable --arch=x86_64 --command=mscore --file-forwarding org.musescore.MuseScore @@ %F @@
Warning: QT_DEVICE_PIXEL_RATIO is deprecated. Instead use:
QT_AUTO_SCREEN_SCALE_FACTOR to enable platform plugin controlled per-screen factors.
QT_SCREEN_SCALE_FACTORS to set per-screen DPI.
QT_SCALE_FACTOR to set the application global scale factor.
Gtk-Message: 10:35:11.109: Failed to load module "xapp-gtk3-module"
Gtk-Message: 10:35:11.149: Failed to load module "unity-gtk-module"
Gtk-Message: 10:35:11.149: Failed to load module "unity-gtk-module"

(mscore:2): GLib-GIO-ERROR **: 10:35:11.149: Settings schema 'org.cinnamon.desktop.interface' is not installed

On a personal note: I can't stand using Flatpak, Snap, or AppImages, each for various different reasons. I would prefer a .deb repository/PPA, but the current Musescore PPA is woefully outdated, so I'm stuck.

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