/usr/share/doc/kde/HTML/en/kioslave/telnet/common is in kdelibs5-data 4:4.14.16-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/kde/HTML/en/kioslave/telnet/../../common
/usr/share/doc/kde/HTML/en/kioslave/telnet/../../common