/usr/lib/x86_64-linux-gnu/libdunegridglue.so is in libdune-grid-glue-dev 2.4.0-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdunegridglue-2.4.0.so
/usr/lib/x86_64-linux-gnu/libdunegridglue-2.4.0.so