non-ubuntu packages don't appear in 'Add/Remove Applications'

Projekt:Trisquel
Version:8.0
Komponente:Gnome
Kategorie:Aufgabe
Priorität:normal
Zugewiesen:nicht zugewiesen
Status:active
Beschreibung

IceCat and Abrowser, for instance, are missing. I believe that this is because /usr/share/app-install/desktop has not been updated from Ubuntu.