step by step:
1. Should install certain libraries:
sudo apt-get install g++ curl libssl-dev apache2-utils
2. Now, Download node.js with GIT
git clone git://github.com/ry/node.git
3.You are ready to install node.js
cd node
./configure
make
sudo make install
note:if need, you can type : sudo apt-get install git-core to install GIT.