$ sudo apt-get update
$ sudo apt-get install libjs-plupload 

libjs-plupload is installed in your system.

Make ensure the libjs-plupload package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjs-plupload *

You will get with libjs-plupload package name, version, architecture and description in a table

libjs-plupload package basic information: