Flatpak apps cannot prompt for the file manager on Fedora GNOME templates

[TommyTran732]

Qubes OS release

4.2

Brief summary

I am noticing a very strange issue where the Flatpak build of Mullvad Browser and Celluloid cannot seem to open any file manager (be it Nautilus or Thunar) to prompt for files/directories on Fedora GNOME templates.

This behavior is not reproducible with:

• An actual Fedora system
• Upstream’s Mullvad Browser on Fedora templates
• The Debian GNOME Template

This behavior is reproducible with both the Fedora 39 and 40 GNOME templates.

It is very unlikely that this is caused by the Flatpak apps. Rather, I suspect that some important dependencies are missing from Qubes’s Fedora templates, or that there is a misconfiguration somewhere.

Steps to reproduce

• Install Flatpak Mullvad Browser in an AppVM based on a Fedora GNOME template.
• Try to download a file.

Expected behavior

A prompt with nautilus appears for the download location.

Actual behavior

Nothing happens.

[legoktm]

Do you have xdg-desktop-portal-gtk installed? I had to manually install it too.