Comment 3 for bug 1784602

I can confirm this behavior -- there's a bug in the postinst script where it makes sure we don't restart the daemon during "dpkg-reconfigure" (since that should only happen during install/upgrade), but instead it also stops us from prompting during "dpkg-reconfigure", which isn't right.

I think we need to move the check for "dpkg-reconfigure" slightly further inward to only apply to the actual restart event so that we still prompt (and can thus configure non-interactive installs appropriately).