# How to install virtual box guest addition

virtualbox

I have install an 'Ubuntu server' environment on top of Virtual box which runs under Windows7.

How can I install virtual box guest addition?
I have added the 'GuestAddition.iso' file under 'Storage'. But when I start the machine, I go to '/media/cdrom', there is nothing under that directory.

how can I fix it? I want my 'Ubuntu server window' (defined by Virtual box) bigger.

Thank you.

sudo apt-get install virtualbox-ose-guest-utils