Install Latest Versions NodeJS NPM on ubuntu

Use NodeSource PPA. For details look at the installation instructions.

curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash -
sudo apt-get install -y nodejs

Alternatively, for Node.js v5:

curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash -
sudo apt-get install -y nodejs

P.S.:

curl

package must be installed on server for these code lines.

Upgrading

If you have

nodejs

already installed and want to update, then first remove current instalation and install it again using scripts above.

sudo apt-get remove --purge nodejs npm