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

Proxecto:Trisquel
Versión:8.0
Componente:Gnome
Categoría:tarefa
Prioridade:normal
Asignado:Sen asignar
Estado:active
Descrición

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