/etc/init/acpid.conf is in acpid 1:2.0.21-1ubuntu2.
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 9 10 11 12 13 14 | # acpid - ACPI daemon
#
# The ACPI daemon provides a socket for other daemons to multiplex kernel
# ACPI events from, and a framework for reacting to those events.
description "ACPI daemon"
start on runlevel [2345]
stop on runlevel [!2345]
expect fork
respawn
exec acpid -c /etc/acpi/events -s /var/run/acpid.socket
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