/usr/lib/x86_64-linux-gnu/libqhull.so is in libqhull-dev 2015.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libqhull.so.7
/usr/lib/x86_64-linux-gnu/libqhull.so.7