/etc/init/udev.conf is in udev 232-25+deb9u8.
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 | # udev - device node and kernel event manager
#
# The udev daemon receives events from the kernel about changes in the
# /sys filesystem and manages the /dev filesystem.
description "device node and kernel event manager"
start on virtual-filesystems
stop on runlevel [06]
expect fork
respawn
exec /lib/systemd/systemd-udevd --daemon
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