using npm in ubuntu code example
Example 1: install nodejs on ubuntu
sudo apt-get install curl
curl -sL https://deb.nodesource.com/setup_13.x | sudo -E bash -
sudo apt-get install nodejs
node -v #to check if its installed
Example 2: 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