$ sudo apt-get update
$ sudo apt-get install qt4-qmlviewer 

qt4-qmlviewer is installed in your system.

Make ensure the qt4-qmlviewer package were installed using the commands given below,

$ sudo dpkg-query -l | grep qt4-qmlviewer *

You will get with qt4-qmlviewer package name, version, architecture and description in a table

qt4-qmlviewer package basic information: