Install the latest Node npm on Ubuntu 12.04 - lifuzu/cafe GitHub Wiki

Install with Chris PPA:

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs

Install with source code directly:

sudo apt-get install g++ curl libssl-dev apache2-utils git-core
git clone git://github.com/joyent/node.git
cd node
./configure
make
sudo make install