Install virtualbox-guest-x11 by entering the following commands in the terminal:
sudo apt update sudo apt install virtualbox-guest-x11
Description:
x86 virtualization solution - X11 guest utilities
VirtualBox is a free x86 virtualization solution allowing a wide range of x86 operating systems such as Windows, DOS, BSD or Linux to run on a Linux system. . This package provides the X11 guest utilities for VirtualBox. These utilities are meant to be run inside the virtual machine. They provide closer integration and improve the interactive performance.
Homepage: https://www.virtualbox.org
Version: 5.2.10-dfsg-6
Section: multiverse/x11