/usr/share/doc/kde/HTML/en/kioslave/audiocd/common is in kio-audiocd 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/kde/HTML/en/kioslave/audiocd/../../common
/usr/share/doc/kde/HTML/en/kioslave/audiocd/../../common