/usr/lib/x86_64-linux-gnu/libntdb.so.1 is in libntdb1 1.0-9.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libntdb.so.1.0
/usr/lib/x86_64-linux-gnu/libntdb.so.1.0