/usr/lib/x86_64-linux-gnu/libtdb.so is in libtdb-dev 1.3.8-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libtdb.so.1.3.8
/usr/lib/x86_64-linux-gnu/libtdb.so.1.3.8