/usr/lib/x86_64-linux-gnu/libugS2.so is in libdune-uggrid-dev 2.5.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libugS2.so.2.5.0
/usr/lib/x86_64-linux-gnu/libugS2.so.2.5.0