/usr/lib/x86_64-linux-gnu/libmyproxy.so is in libmyproxy-dev 5.9-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmyproxy.so.5.0.9
/usr/lib/x86_64-linux-gnu/libmyproxy.so.5.0.9