/usr/lib/x86_64-linux-gnu/libQt5SystemInfo.so.5 is in libqt5systeminfo5 5.0~git20141206~44f70d99-0ubuntu8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libQt5SystemInfo.so.5.4.0