/etc/init/mosquitto.conf is in mosquitto 0.15-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | description "Mosquitto MQTT broker"
author "Roger Light <roger@atchoo.org>"
start on net-device-up
respawn
exec /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
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