/usr/lib/x86_64-linux-gnu/liblber.so is in libldap2-dev 2.4.45+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblber-2.4.so.2.10.8
/usr/lib/x86_64-linux-gnu/liblber-2.4.so.2.10.8