Al estar instalando PowerDNS me topé con este problema:
Setting up pdns-doc (2.9.22-3) ...
Processing triggers for pdns-server ...
invoke-rc.d: unknown initscript, /etc/init.d/pdns not found.
dpkg: error processing pdns-server (--configure):
subprocess installed post-installation script returned error exit status 100
Errors were encountered while processing:
pdns-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
El problema salió por andar borrando scripts manualmente. Para resolverlo:
sudo apt-get --purge remove pdns-server
