Comment 15 for bug 1718453

apt does what it is told – appstream configures apt to download only the files for the native architecture, so there is no sensible action to be taken by apt and hence this task invalid.

If "$(NATIVE_ARCHITECTURE)" in the apt.conf file shipped by appstream is changed to "$(ARCHITECTURE)" apt will download the files for all configured architectures – if that is really desired is what appstream developers have to figure out. I will add that it might be also a good idea to add support for Components-all first to avoid at least a bit of duplication (yes, apt supports downloading those files, too, it just wont by default – but that default can be switched via Release file metadata).