/usr/share/doc/kde/HTML/en/kioslave/rlogin/common is in kdelibs5-data 4:4.8.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/kde/HTML/en/kioslave/rlogin/../../common
/usr/share/doc/kde/HTML/en/kioslave/rlogin/../../common