$ sudo apt-get update
$ sudo apt-get install qpdfview-ps-plugin 

qpdfview-ps-plugin is installed in your system.

Make ensure the qpdfview-ps-plugin package were installed using the commands given below,

$ sudo dpkg-query -l | grep qpdfview-ps-plugin *

You will get with qpdfview-ps-plugin package name, version, architecture and description in a table

qpdfview-ps-plugin package basic information: