HowTo Achieve "Ubuntu-Desktop-Minimal" - Ubuntu Forums
http://ubuntuforums.org/showthread.php?t=1155961

I've noticed on brainstorm.ubuntu.com that there are a few people who would like to have an ubuntu-desktop-minimal edition instead of the default ubuntu-desktop which bundles software that not all of us use. I'm one of those users who likes to build his system from the ground up, so I wrote this simple post-install script which will give you a complete minimal desktop. After running this script your system will look the same as a fresh install of ubuntu just without all the added software. The first step to accomplish this is install a base system either using the Ubuntu Minimal CD (I use this along with my personal repository to create quick installs) or you can use the Ubuntu Server edition. Once the base installation completes, login and run the following script, then reboot.

ubuntuミニマルインストール法　サーバーエディションなどをインストールしたあとxとgnomeの基本的なパッケージを追加