$ sudo apt-get update
$ sudo apt-get install debconf-kde-helper 

debconf-kde-helper is installed in your system.

Make ensure the debconf-kde-helper package were installed using the commands given below,

$ sudo dpkg-query -l | grep debconf-kde-helper *

You will get with debconf-kde-helper package name, version, architecture and description in a table

debconf-kde-helper package basic information: