npm is the package manager for the Node JavaScript platform. When we used installed npm on Ubuntu using following command
$ sudo apt install npm
By default ubuntu unstalled npm version 3.5.2, which you can check as,
$ npm -version
3.5.2
But the software, we were trying to compile required npm version more than 3.5.2, so we upgraded npm to latest stable version using below command,
$ sudo npm install npm@latest -g
Now you can check the version of latest npm as,
$ npm -version
6.14.5