/lib/modprobe.d/systemd.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 16 17 18 19 20 | # SPDX-License-Identifier: LGPL-2.1+
#
# 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.
#
# When bonding module is loaded, it creates bond0 by default due to max_bonds
# option default value 1. This interferes with the network configuration
# management / networkd, as it is not possible to detect whether this bond0 was
# intentionally configured by the user, or should be managed by
# networkd/NM/etc. Therefore disable bond0 creation.
options bonding max_bonds=0
# Do the same for dummy0.
options dummy numdummies=0
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