/usr/lib/x86_64-linux-gnu/libbfb.so is in libbfb0-dev 0.24-4build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libbfb.so.0
/usr/lib/x86_64-linux-gnu/libbfb.so.0