In a new Debian installation, I updated the Node.js and npm to the latest version, so I followed the installation steps one by one.

git clone https://github.com/nasa/openmct.git
npm install
npm start

When I try to open the browser on localhost:8080 I get the page but it is not being rendered, nothing appears on the screen. Apparently the system is not managing to load some resources, I am getting 404 in the following files:

bower_components/requirejs/require.js
platform/commonUI/general/res/css/openmct.css
platform/commonUI/general/res/css/startup-base.css