All reports of unknown-architecture for the archive. The extended description of this tag is:
This package claims to be for an unknown architecture. The architecture should be one of the values supported by dpkg or one of the special values "all" or "any". The special value "source" is only used in *.changes files and does not make sense in a binary package or a *.dsc file.
This tag has not been emitted in any package tested by Lintian.