I have been looking for decent tutorials on installing node.js specifically on Ubuntu 10.04. And been into forums where there people have a lot of ideas regarding this matter. I you happen to pass by looking for similar topic around the net. Here is what I can recommend. Much easier than what you think.
Run terminal and Type In:
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