There is a workaround for this bug, which I found at:
where you manually disable avahi-daemon before the dpkg operation and reenable 
it afterwards:

1. sudo systemctl disable avahi-daemon
2. (upgrade/reinstall avahi-dnsconfd)
3. sudo systemctl enable avahi-daemon

This worked for me on 16.04.4.

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  package avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2 failed to
  install/upgrade: subprocess new pre-removal script returned error exit
  status 1

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