/usr/lib/x86_64-linux-gnu/libKF5AkonadiWidgets.so.5 is in libkf5akonadiwidgets5 4:15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libKF5AkonadiWidgets.so.5.1.3