/usr/lib/linux-tools/4.18.0-16-generic/usbip is in linux-tools-4.18.0-16-generic 4.18.0-16.17~18.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.18.0-16-generic/../../linux-hwe-tools-4.18.0-16/usbip