/usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5.1 is in libqt5webkit5 5.1.1-1ubuntu8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5.1.1
/usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5.1.1