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

libjs-protoaculous is installed in your system.

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

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

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

libjs-protoaculous package basic information: