/usr/lib/libkontactprivate.so.4 is in kontact 4:4.8.4a-0ubuntu0.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libkontactprivate.so.4.8.0
/usr/lib/libkontactprivate.so.4.8.0