They offer quality of life type improvements for working with your virtual machine: The VirtualBox guest additions consist of a set of drivers and kernel modules for the operating system, when installed as a VirtualBox virtual machine. The reason for this is that the Ubuntu 22.04 installer does not install the so called VirtualBox guest additions.

For example after resizing the virtual machine window or going into full-screen mode. In you ever installed Ubuntu in a VirtualBox virtual machine, you probably noticed that you can’t change the screen resolution. This article explains how to install the VirtualBox guest additions in an Ubuntu 22.04 virtual machine.

Besides automatically adjusting the screen resolution, you also get support for a bi-directional clipboard and shared folders. Bummed that you can’t change the screen resolution in your freshly installed Ubuntu virtual machine? An easy fix exists for this: You just need to install the VirtualBox guest additions in your Ubuntu 22.04 VirtualBox virtual machine.

Uninstall virtualbox ubuntu