All reports of dir-or-file-in-etc-opt for the archive. The extended description of this tag is:

Debian packages should not install into /etc/opt, because it is reserved for add-on software.

Refer to Filesystem Hierarchy Standard (/opt : Add-on application software packages) for details.

Severity: serious, Certainty: certain

Check: files, Type: binary, udeb

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