Virtualbox: install guest additions on Ubuntu 20.04 LTS Focal Fossa - LinuxConfig.org

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