3.13.0-32.57) is not available, but a newer one is (3.13.0-166.216). We redirected you there.
/usr/lib/linux-tools/4.15.0-29-lowlatency/usbipd is in linux-tools-4.15.0-29-lowlatency 4.15.0-29.31~16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.15.0-29-lowlatency/../../linux-hwe-tools-4.15.0-29/usbipd