/usr/lib/tmpfiles.d/debian.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 12 13 14 15 | # This file is part of the debianisation of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# See tmpfiles.d(5) for details
# Type Path Mode UID GID Age Argument
L /run/initctl - - - - /run/systemd/initctl/fifo
L /run/shm - - - - /dev/shm
d /run/sendsigs.omit.d 0755 root root -
L+ /etc/mtab - - - - ../proc/self/mounts
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