/usr/lib/x86_64-linux-gnu/libusb.so is in libusb-dev 2:0.1.12-25.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4
/lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4