I discovered the reason for missing addons in GNOME Software by accident a few weeks back.
Apply those two patches to appstream-glib in Xenial, and the addons should appear: https://github.com/hughsie/appstream-glib/commit/ea8b160c8f05ae018dcf54181204cc5740c2aa1c https://github.com/hughsie/appstream-glib/commit/2c479053850958575c8de50fbee4433ec05019d3 (this only applies to AddOns which have AppStream metadata though) ** Also affects: appstream-glib (Ubuntu) Importance: Undecided Status: New ** Changed in: appstream-glib (Ubuntu) Status: New => Triaged ** Changed in: appstream-glib (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1581775 Title: No option to (de)select add ons upon installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/appstream-glib/+bug/1581775/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs