Node.js and npm are major requirements for using the Web UI.
npm is included in the installation of Node.js.
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt-get install -y nodejs
Download the latest LTS Release of Node.js from here - Choose the Windows Installer (.msi)
for your Operating System type (32-bit vs 64-bit). Once the file is downloaded, double click on it to start the installation. The process is very simple, you can leave all the default options and simply press Next
throughout the process.