/usr/lib/x86_64-linux-gnu/libhud-client.so is in libhud-client2-dev 13.10.1+14.04.20140402-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libhud-client.so.2
/usr/lib/x86_64-linux-gnu/libhud-client.so.2