The VirtualBox Guest Additions consist of device drivers that allow for better screen resolution an mouse integration. They will optimize your operating system with respect to its performance and usability. In this tutorial we will be installing the Virtualbox Guest Additions on Ubuntu 20.04 LTS Focal Fossa Linux.
This is a companion discussion topic for the original entry at https://linuxconfig.org/virtualbox-install-guest-additions-on-ubuntu-20-04-lts-focal-fossa
DO NOT USE THIS GUIDE if you are using Ubuntu SERVER it will turn it to a visual version of it. Unfortunately I had to reinstall everything since I didn’t want to spend more time getting back. And don’t get me wrong, I tried, but not even the terminal was able to start. So author of this post, PLEASE PLEASE put a warning or enhance it when working with Ubuntu Server.