The file is listed more than once in your
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.
The tag is present in Lintian version
That is the most recent version we know about.
We use semantic versions.
The patch number is a commit step indicator relative to the
release tag in our Git
You can find the detection logic for this version at commit ffc17eb. For merge requests, please use the latest version in the Lintian check conffiles.