/usr/lib/x86_64-linux-gnu/libbpp-seq.so.9 is in libbpp-seq9v5 2.2.0-1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libbpp-seq.so.9.1.3
/usr/lib/x86_64-linux-gnu/libbpp-seq.so.9.1.3