/usr/lib/x86_64-linux-gnu/libhx509.so.5 is in libhx509-5-heimdal 1.7~git20150920+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libhx509.so.5.0.0
/usr/lib/x86_64-linux-gnu/libhx509.so.5.0.0