/etc/init/hostname.conf is in hostname 3.16ubuntu2.
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 | #
# This task is run on startup to set the system hostname from /etc/hostname,
# falling back to "localhost" if that file is not readable or is empty and
# no hostname has yet been set.
description "set system hostname"
start on startup
task
exec hostname -b -F /etc/hostname
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