so fuseiso is a special program you decide to use and not something gnome-mount knows about, the way to solve that would be to not list those mounts in GNOME or to teach gnome-mount how to use fuseiso when it's installed
so fuseiso is a special program you decide to use and not something gnome-mount knows about, the way to solve that would be to not list those mounts in GNOME or to teach gnome-mount how to use fuseiso when it's installed