/usr/lib/tmpfiles.d/systemd-nologin.conf is in systemd 237-3ubuntu10.
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 file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
# See tmpfiles.d(5), systemd-user-session.service(5) and pam_nologin(8).
# This file has special suffix so it is not run by mistake.
F! /run/nologin 0644 - - - "System is booting up. See pam_nologin(8)"
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