$ sudo apt-get update
$ sudo apt-get install libkdewebkit5 

libkdewebkit5 is installed in your system.

Make ensure the libkdewebkit5 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkdewebkit5 *

You will get with libkdewebkit5 package name, version, architecture and description in a table

libkdewebkit5 package basic information: