NPM is the package manager for the Node.js platform.
To install node.js and npm in ubuntu, do the following :
# apt install nodejs
Once nodejs is installed, install npm using :
# apt install npm
This may result in an error :
The following packages have unmet dependencies:
npm : Depends: node-gyp (>= 0.10.9) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Correct the problem by installing the missing dependencies, using :
# sudo apt-get install nodejs-dev node-gyp libssl1.0-dev
Once done, install npm :
# apt install npm
This should get the node.js and npm installed in your ubuntu server.
Install packages required using :
# npm install <package-name>