$ sudo apt-get update
$ sudo apt-get install libqtwebkit-qmlwebkitplugin 

libqtwebkit-qmlwebkitplugin is installed in your system.

Make ensure the libqtwebkit-qmlwebkitplugin package were installed using the commands given below,

$ sudo dpkg-query -l | grep libqtwebkit-qmlwebkitplugin *

You will get with libqtwebkit-qmlwebkitplugin package name, version, architecture and description in a table

libqtwebkit-qmlwebkitplugin package basic information: