[Resolved] Flatpak does not install on POP_OS

kdredington

Attempting to Install oriongtk.alpha.external.flatpak on POP OS COSMIC 24.04 and Fedora COSMIC 43 results in runtime error.

First installation method:
The default flatpak app or store does not automatically install the .flatpak via store or package manger. No error just does not recognize the .flatpak as a pacakge.

Second method:
Installing via Flatpak CLI "flatpak install oriongtk.alpha.external.flatpak"
Error "The application com.kagi.OrionGtk/x86_64/master requires the runtime org.gnome.Platform/x86_64/49 which was not found"

Note: POP OS 24.04 uses the Wayland with Rust based COSMIC DE and leverages Ubuntu 24.04 base. Fedora COSMIC is Fedora with the Wayland with Rust based COSMIC DE on top of Fedora 43.

Expected Results:
Orion alpha external flatpak was exepected to be installed via package management (GUI) or via Flatpak CLI

Orion Alpha for Linux

kdredington

SUCCESS!! Time for beta testing.

I have searched and pinged both the COSMIC DE and Orion+ communities without a response. Figured out a solution via flatpak docs and dotlinux.net, Search on "Dependency not found" Error in Flatpak

My assumption is Orion’s Flatpak requires org.gnome.Platform//49 and COSMIC DE does not ship with GNOME runtime 49 to handle Gnome GTK apps. COSMIC is a RUST DE afterall. COSMIC DE does not auto-install this runtime for external Flatpak bundles. Therfore org.gnome.Platform//49 installation is required or alternately org.gnome.Sdk//49 if you want to build gnome flatpaks on COSMIC.

If interested here's my troubleshooting steps and solution for the failure to install the flatpak.
I queried flatpak on Fedora Cosmic and confirmed the runtime org.gnome.Platform/x86_64/49 exists, despite the error stating the runtime was not found.

Verify Flathub is listed using the remotes command:
flatpak remotes

Ensure Flathub is enabled
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Install the missing GNOME 49 runtime manually
flatpak install flathub org.gnome.Platform/x86_64/4

Update Flatpak + runtimes
flatpak update

Clear Flatpak cache
flatpak repair

Try again to re‑install the app. Ensure you are in the same directory or insert the path before the flatpak bundle name.
flatpak install oriongtk.earlybeta.flatpak

Orion can now be run via CLI, Launcher, or App Center