/usr/lib/x86_64-linux-gnu/libhd.so is in libhd-dev 21.38-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libhd.so.21
/usr/lib/x86_64-linux-gnu/libhd.so.21