upgrade npm version ubuntu 18.04 code example
Example 1: npm install ubuntu 20.04
$ sudo apt install nodejs
Example 2: 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
Example 3: how to update node in ubuntu 18.04
sudo npm cache clean -f
sudo npm install -g n
sudo n stable