/usr/lib/x86_64-linux-gnu/liblmdb.so is in liblmdb-dev 0.9.14-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblmdb.so.0
/usr/lib/x86_64-linux-gnu/liblmdb.so.0