Gradience, Flatseal, Loupe Image Viewer, and Resources running on Ubuntu 16.04

Firefox 118.0.2 running on Ubuntu 16.04

Door Knocker, Collision, and Cartridges running on Ubuntu 16.04

ASHPD Demo running on Ubuntu 16.04, showing a notification through XDG portals

According to Door Knocker, almost half of the portals are unavailable on Ubuntu 16.04, compared to only one unavailable on Fedora 39 with GNOME, which means Flatpaks running here may have more limited capabilities than usual.