Lintian tag information: duplicate-conffile (type: error)
Description (from lintian-explain-tags)
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 Show-Always: no Check: conffiles