/usr/lib/x86_64-linux-gnu/libpackagekit-glib2.so is in libpackagekit-glib2-dev 0.8.17-4ubuntu6~gcc5.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpackagekit-glib2.so.16.3.0