All reports of public-upstream-key-unusable for the archive. The extended description of this tag is:
The source package contains a public upstream signing key that contains bogus, unexpected or unsuitable data.
Please obtain the correct key from upstream.
Refer to the uscan(1) manual page for details.
Severity: wishlist, Certainty: certain
Check: debian/upstream/signing-key, Type: source
This tag has not been emitted in any package tested by Lintian.