/usr/share/doc/python-pyqt5.qtmultimedia-dbg is in python-pyqt5.qtmultimedia-dbg 5.5.1+dfsg-3ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-pyqt5.qtmultimedia
/usr/share/doc/python-pyqt5.qtmultimedia