/usr/share/doc/kde/HTML/en/calligra/common is in calligra-data 1:2.8.1-1-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/kde/HTML/en/calligra/../common
/usr/share/doc/kde/HTML/en/calligra/../common