Preparing to unpack .../ddclient_3.8.2-2ubuntu2_all.deb ...
Unpacking ddclient (3.8.2-2ubuntu2) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for systemd (229-4ubuntu21.1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Setting up ddclient (3.8.2-2ubuntu2) ...
dpkg: error processing package ddclient (--configure):
 subprocess installed post-installation script returned error exit status 1