Flatpak runtime extensions are not installed when using GNOME Software on Ubuntu
When installing a Flatpak application that depends on some runtimes and they depend on some additional runtime extensions using GNOME Software on Ubuntu 18.04, the runtime extensions are not installed. They are installed if you run "flatpak update" from Terminal after the installation. This issue should already be fixed in GNOME Software upstream, but I currently don't have any Fedora Rawhide machine here so I cannot test if this is really an Ubuntu issue or upstream one.
Steps to Reproduce:
- Use the latest, fully updated Ubuntu 18.04 image.
- Install "flatpak" and "gnome-software-plugin-flatpak" packages.
- Restart the system.
- Download and add the Flathub repo file: https://dl.flathub.org/repo/flathub.flatpakrepo
- Search and install the "GNOME Web" Flatpak package using GNOME Software.
- Run the installed "Web" application.
Actual results: GNOME Web is started with the default (Adwaita) theme (and without the correct locale if you use non-English system).
Expected results: GNOME Web is started with the correct (Ubuntu) theme (and with the correct locale if you use non-English system).