Install nodejs on Ubuntu from tar.xz

Download nodejs from https://nodejs.org/en/

sudo mkdir /usr/lib/nodejs
sudo tar -xJvf node-v<yourVersion>-linux-x64.tar.xz -C /usr/lib/nodejs
sudo mv /usr/lib/nodejs/node-v<yourVersion>-linux-x64 /usr/lib/nodejs/node-v<yourVersion>

Set the environment variable ~/.profile

export NODEJS_HOME=/usr/lib/nodejs/node-v6.5.0
export PATH=$NODEJS_HOME/bin:$PATH

Refresh profile
. ~/.profile

Test installation using
$ node -v

Thanks to: https://github.com/nodejs/help/wiki/Installation