/usr/lib/x86_64-linux-gnu/libisds.so is in libisds-dev 0.10.7-1build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libisds.so.5.5.0
/usr/lib/x86_64-linux-gnu/libisds.so.5.5.0