/usr/lib/x86_64-linux-gnu/libKF5AkonadiSearchPIM.so.5 is in libkf5akonadisearchpim5 16.04.3-1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libKF5AkonadiSearchPIM.so.5.2.3