/usr/lib/x86_64-linux-gnu/libhud-gtk.so is in libhud-gtk1-dev 14.10+17.10.20170619-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libhud-gtk.so.1
/usr/lib/x86_64-linux-gnu/libhud-gtk.so.1