Comment 15 for bug 1565772

Here is my output for /etc/signon-ui/webkit-options.don a 16.10 desktop system that was upgraded from 16.04:

$ dpkg -S /etc/signon-ui/webkit-options.d/*
account-plugin-google: /etc/signon-ui/webkit-options.d/accounts.google.com.conf
account-plugin-twitter: /etc/signon-ui/webkit-options.d/api.twitter.com.conf
account-plugin-identica: /etc/signon-ui/webkit-options.d/identi.ca.conf
account-plugin-windows-live: /etc/signon-ui/webkit-options.d/login.live.com.conf
account-plugin-flickr: /etc/signon-ui/webkit-options.d/login.yahoo.com.conf
account-plugin-facebook: /etc/signon-ui/webkit-options.d/www.facebook.com.conf
$

These are conffiles. It is not sufficient to stop shipping them in the package, you must also remove them from the filesystem on upgrade using dpkg-maintscript-helper. You can do this, for example, by adding a file debian/account-plugin-google.maintscript to your packaging which contains the following line:

rm_conffile /etc/signon-ui/webkit-options.d/accounts.google.com.conf 0.13+16.04.20161212~ account-plugin-google

You need to do this for each of the packages which is removing a conffile. And this change also needs to be made for 16.10 and 17.04, since users of those releases who upgraded from 16.04 will still have those files left behind.