/etc/init/control-alt-delete.conf is in upstart 1.11-5.
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 | # control-alt-delete - emergency keypress handling
#
# This task is run whenever the Control-Alt-Delete key combination is
# pressed, and performs a safe reboot of the machine.
description "emergency keypress handling"
author "Scott James Remnant <scott@netsplit.com>"
start on control-alt-delete
task
exec shutdown -r now "Control-Alt-Delete pressed"
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