Install kubuntu-docs by entering the following commands in the terminal:
sudo apt update sudo apt install kubuntu-docs
Description:
kubuntu system documentation
This package contains the system documentation for the Kubuntu GNU/Linux distribution. Full system support for Kubuntu with the KDE desktop can be obtained by installing this package.
Homepage: http://userbase.kde.org/Kubuntu
Version: 15.04ubuntu2
Section: universe/doc