sudo dpkg --purge --force-all repowerd
dpkg: repowerd: dependency problems, but removing anyway as you requested:
 ubuntu-system-settings depends on powerd (>= 0.15) | gnome-settings-daemon; however:
  Package powerd is not configured yet.
  Package repowerd which provides powerd is to be removed.
  Package gnome-settings-daemon is not installed.

(Reading database ... 400491 files and directories currently installed.)
Removing repowerd (2016.10+16.04.20161007-0ubuntu1) ...
Failed to stop repowerd.service: Unit repowerd.service not loaded.
dpkg: error processing package repowerd (--purge):
 subprocess installed pre-removal script returned error exit status 5
Failed to start repowerd.service: Unit repowerd.service is not loaded properly: File exists.
See system logs and 'systemctl status repowerd.service' for details.
repowerd.service couldn't start.
Errors were encountered while processing:
 repowerd