/lib/systemd/ is in udev 229-4ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/lib/systemd/network/
/lib/systemd/network/90-mac-for-usb.link
/lib/systemd/network/99-default.link
/lib/systemd/system/
/lib/systemd/system/sockets.target.wants/
/lib/systemd/system/sockets.target.wants/systemd-udevd-control.socket
/lib/systemd/system/sockets.target.wants/systemd-udevd-kernel.socket
/lib/systemd/system/sysinit.target.wants/
/lib/systemd/system/sysinit.target.wants/systemd-hwdb-update.service
/lib/systemd/system/sysinit.target.wants/systemd-udev-trigger.service
/lib/systemd/system/sysinit.target.wants/systemd-udevd.service
/lib/systemd/system/systemd-hwdb-update.service
/lib/systemd/system/systemd-udev-settle.service
/lib/systemd/system/systemd-udev-trigger.service
/lib/systemd/system/systemd-udevd-control.socket
/lib/systemd/system/systemd-udevd-kernel.socket
/lib/systemd/system/systemd-udevd.service
/lib/systemd/system/udev.service
/lib/systemd/systemd-udevd