/usr/lib/x86_64-linux-gnu/libpolybori_groebner-0.8.so is in libpolybori-groebner-dev 0.8.3-3+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpolybori_groebner-0.8.so.3
/usr/lib/x86_64-linux-gnu/libpolybori_groebner-0.8.so.3