All reports of invalid-arch-string-in-source-relation for the archive. The extended description of this tag is:

The architecture string in the source relation includes an unknown architecture. This may be a typo, or it may be an architecture that dpkg doesn't know about yet. A common problem is incorrectly separating architectures with a comma, such as [i386, m68k]. Architectures are separated by spaces; this should instead be [i386 m68k].

Refer to Debian Policy Manual section 5.6.8 (Architecture) for details.

Severity: important, Certainty: possible

Check: fields, Type: binary, udeb, source

This tag has not been emitted in any package tested by Lintian.