nodejs is not avialabe in ubuntu repo 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: install node js using nvm ubuntu

curl -sL https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh -o install_nvm.sh