/usr/lib/x86_64-linux-gnu/libKF5AkonadiPrivate.so.5 is in libkf5akonadiprivate5 4:15.12.3-0ubuntu6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libKF5AkonadiPrivate.so.5.1.51