On the release notes for Artful we should add a about this along the usual 
Libvirt update info.
There is no release note wiki/template for Artful yet, so I added a tracker for 
that.

An example could look like:

There was an issue in libvirt (bug 1694159) about handling conffiles when 
upgrading from Xenial (16.04) to latter releases. This issue lead to duplicate 
conffiles carrying the old libvirt-bin names/references.
Since Yakkety (16.10) those files are inactive but still around. That is 
misleading at best - e.g. if users try to modify them and wonder why the daemon 
do not pick up the changes. Therefore those conffiles will get cleaned up now.
For LTS (16.04) -> LTS (18.04) upgraders, but also for Xenial -> Ubuntu Cloud 
Archive Pike transitions this will be fine. In those cases there never were 
inactive duplicates, so the upgrade will move and retain user configurations as 
it should have done back in Yakkety.
But users that are already on Yakkety or later will have the duplicate 
conffiles around and moving those might negatively affect a currently working 
setup. Therefore in those cases the old conffiles are removed. If there was any 
custom content present they will be backed up as usual with a .dpkg-bak suffix 
and the user prompted about that on the upgrade.
In general changes to the affected conffiles are rather rare, so for most users 
the upgrade will just remove a few old inactive conffiles.

** Also affects: ubuntu-release-notes
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1694159

Title:
  Complete libvirt migration to Debian style packaging (dependencies,
  conffiles)

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