$ sudo apt-get update
$ sudo apt-get install gnome-network-admin 

gnome-network-admin is installed in your system.

Make ensure the gnome-network-admin package were installed using the commands given below,

$ sudo dpkg-query -l | grep gnome-network-admin *

You will get with gnome-network-admin package name, version, architecture and description in a table

gnome-network-admin package basic information: