/lib/systemd/system/sockets.target.wants/udev-control.socket is in udev 175-0ubuntu9.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/systemd/system/sockets.target.wants/../udev-control.socket
/lib/systemd/system/sockets.target.wants/../udev-control.socket