Lintian Reports

E duplicate-conffile

The file is listed more than once in your debian/conffiles file. Usually, this is because debhelper (dh_installdeb, compat level 3 or higher) will add any files in your package located in /etc automatically to the list of conffiles, so if you do that manually too, you'll get duplicates.

Visibility: error

Check: conffiles

These source packages in the archive trigger the tag.