All reports of conffile-has-bad-file-type for the archive. The extended description of this tag is:

The conffiles lists this path, which is not a file. This will almost certainly not work.

Note that dpkg does not support symlinks being conffiles.

Refer to and for details.

Severity: important, Certainty: certain

Check: conffiles, Type: binary

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