/usr/lib/x86_64-linux-gnu/libnss_ldap.so is in libnss-ldap 265-5ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libnss_ldap.so.2
/lib/x86_64-linux-gnu/libnss_ldap.so.2