I've been trying out Flatpaks recently. After I installed the Steam flatpak, and installed MG, MG wouldn't run. Although MG runs fine through my regular steam client (installed from the Debian repo). When I click to start MG, a small steam dialog appears for less than a second then disappears. Nothing else happens.console output
I only have one other Steam game, "Time Clickers", and that runs from the Steam client installed as a Flatpak.