VirtualBox - Debian Wiki
wiki.debian.org › VirtualBoxAdd the Fast Track repository by following the instructions at https://fasttrack.debian.net/ Install the VirtualBox package with: sudo apt install virtualbox. Optionally install the extension pack with: sudo apt install virtualbox-ext-pack. Debian 9 "Stretch" Packages for VirtualBox are not available in Debian 9.
VirtualBox - Debian Wiki
https://wiki.debian.org/VirtualBoxPackages for VirtualBox's Guest Additions are not officially available in stable releases of Debian, due to lack of cooperation from upstream on security support for older releases. See 794466 However, new versions of the Guest Additions (along with the rest of VirtualBox) are made available to stable users on a "rolling" basis by Debian Fast Track, a Debian project.
How to Install Debian 11 on VirtualBox
https://linoxide.com/install-debian-11-on-virtualbox19.08.2021 · VirtualBox is open-source cross-platform virtualization software that allows running multiple guest operating systems. Debian 11 comes with multiple Desktop environments such as Gnome, KDE, LXDE, LXQT, Mate, Xfce, and Cinnamon. Let's install Debian 11 on VirtualBox with Gnome Desktop Environment. Prerequisites. VirtualBox installed on your computer