Easiest way to install NS2 in Ubuntu

For NS2 installation I browsed a lot on net but  found very lengthy time consuming procedures.Also some of them didnt worked out for me.Then I somehow succeded in installating NS2 through terminal with only two commands.Hereis a very simple procedure to install NS2 in Ubuntu.

REQUIREMENTS :
SuperUser Login
Internet Connection

PROCEDURE :

STEP 1: Installation of NS2

sudo apt-get install ns2

STEP 2: Installation of NAM(GUI)

 sudo apt-get install nam