/usr/lib/x86_64-linux-gnu/libphonon4qt5experimental.so.4 is in libphonon4qt5experimental4 4:4.10.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libphonon4qt5experimental.so.4.10.0