Microsoft Onenote is free notetaking software for Windows, Windows Phone, Mac, iPad, iPhone, Android and Web. And officially it is not available for your favorite linux platform. But linux users can access Onenote officially via the Web version of the Onenote in their browsers. For Ubuntu users, you can install onenote via unofficial P3X OneNote and OneNote Desktop apps. They are basically electron apps. In this tutorial we will see how to install P3X OneNote and OneNote Desktop onenote clients on Ubuntu.