$ sudo apt-get update
$ sudo apt-get install root-plugin-graf3d-x3d 

root-plugin-graf3d-x3d is installed in your system.

Make ensure the root-plugin-graf3d-x3d package were installed using the commands given below,

$ sudo dpkg-query -l | grep root-plugin-graf3d-x3d *

You will get with root-plugin-graf3d-x3d package name, version, architecture and description in a table

root-plugin-graf3d-x3d package basic information: