update node js version in ubuntu code example

Example 1: updating node js ubuntu

curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
sudo apt-get install -y nodejs

Example 2: update node ubuntu

sudo npm cache clean -f
sudo npm install -g n
sudo n stable

Example 3: how to update node in ubuntu 18.04

# Using Ubuntu
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt-get install -y nodejs