The document provides a step-by-step guide for installing the Linux desktop OS (Ubuntu) on Oracle VM VirtualBox, detailing how to create a new virtual machine, configure its settings, and proceed with the installation. It also includes instructions for removing LibreOffice to prepare for the installation of Apache OpenOffice, followed by the steps to download, extract, and install OpenOffice. The process concludes with verifying the successful installation of OpenOffice on the system.