To verify succesful installation of the Guest Additions module, run the following command.
You should now notice the automatic resolution scaling and other features being active. After the packages are done installing, reboot the VM for changes to take effect. $ sudo apt install virtualbox-guest-utils virtualbox-guest-x11 Execute the following commands in terminal. First, we’ll enable the multiverse repository (in case it isn’t already), then use the system’s package manager to refresh package repositories and install the VirtualBox Guest Additions packages. The step by step instructions below will explain how to install VirtualBox Guest Additions on Ubuntu Linux. It gives you automatic resolution scaling, a shared clipboard between the host and VM, and drag and drop ability.
VirtualBox Guest Additions will help you get the most out of your Ubuntu virtual machine.