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• Here is a shell codes on how to install NodeJS and NPM in Ubuntu. I think these codes works as well in other Linux environment.

wget http://nodejs.org/dist/v5.1.0/node-v5.1.0-linux-x64.tar.gz  
sudo tar -C /usr/local --strip-components 1 -xzf node-v5.1.0-linux-x64.tar.gz

• I got these codes from this website, http://stackabuse.com/how-to-install-node-js-on-ubuntu/.