curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
sudo apt install -y nodejs

# or 

curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
sudo apt install -y nodejs

Optional: install build tools. to compile and install native addons from npm you may also need to install build tools:

sudo apt install -y build-essential

Install gulp and bower

https://github.com/johnpapa/pluralsight-gulp

sudo npm install -g gulp bower

List installed

npm list -g --depth=0

Check versions

npm -v
gulp -v
bower -v