/usr/lib/x86_64-linux-gnu/libphonon.so.4 is in libphonon4 4:4.8.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libphonon.so.4.8.0
/usr/lib/x86_64-linux-gnu/libphonon.so.4.8.0