npm how to install and run on the ubuntu 18.04 code example

Example 1: ubuntu 18 install nodejs

cd ~
curl -sL https://deb.nodesource.com/setup_12.x -o nodesource_setup.sh
sudo bash nodesource_setup.sh
sudo apt install nodejs
nodejs -v # shows your version

Example 2: install nodejs from ubuntu 18.04

cd ~
curl -sL https://deb.nodesource.com/setup_10.x -o nodesource_setup.sh