Incorrect Windowing permissions

[hydrian]

When you try to run /usr/bin/flatpak run --branch=stable --arch=x86_64 --command=QOwnNotes org.qownnotes.QOwnNotes the process just hangs after showing these logs messages.

Gtk-Message: 12:56:27.607: Failed to load module "xapp-gtk3-module"
Gtk-Message: 12:56:27.607: Failed to load module "appmenu-gtk-module"
Warning: Qt: Session management error: Could not open network socket (:0, )

From developing Flatpak apps myself, this looks like a windowing manager system permissions issue. I took a look a the QOwnNotes flatpak application with Flatseal, I noticed the flatpak had the permissions socket=wayland, socket=x11, and socket=fallback-x11. All these parameters are exclusive. fallback-x11 assumes both wayland and x11. So all you need to enable is fallback-x11 in the manifest. If you don't, flatpak first tries wayland and fails or hangs the process on an X11 based system. Once I removed the x11 and wayland parameters with Flatseal, QOwnNotes started properly.

Environment

Linux Mint 21.3 - Mate
QOwnNotes - flatpak stable

[Erick555]

this app doesn't have socket=x11 permission. If you see it in flatseal then it must be your own override. socket=fallback-x11 MUST be used with socket=wayland, flathub won't allow publishing app without it. Your problem is something else.