/etc/init/upstart-udev-bridge.conf is in upstart 1.13.2-0ubuntu21.
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 15 16 17 18 19 20 21 22 | # upstart-udev-bridge - Bridge udev events into upstart
#
# This helper daemon receives udev events from the netlink socket and
# emits equivalent Upstart events.
description "Bridge udev events into upstart"
# From upstart-udev-bridge itself
emits *-device-added
emits *-device-removed
emits *-device-changed
# From http://www.kernel.org/pub/linux/utils/kernel/hotplug/libudev/libudev-udev-device.html
emits *-device-online
emits *-device-offline
start on starting udev
stop on stopped udev
expect daemon
respawn
exec upstart-udev-bridge --daemon
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