====== VirtualBox VM ======
===== Guest Additions =====
  * To upgrade the Guest Additions after upgrading the VirtualBox version, download the guest additions pack, shut down all virtual machines then start VirtualBox as root<code>sudo virtualbox</code>
  * After installing the Guest Additions, close VirtualBox and restart it under your user account

===== Install Guest Additions on a Debian 11 guest operating system =====
  - The following steps need to be taken inside the VM after the operating system has been installed
  - Install the kernel headers, DKMS framework, and build tools<code>$ sudo apt update -y && sudo apt upgrade
sudo apt install dkms linux-headers-$(uname -r) build-essential</code>
  - Attach the guest addition ISO to the VM and mount it<code>$ sudo mount /dev/cdrom /mnt/cd</code>
  - Install the VirtualBox guest additions<code>sudo sh /mnt/cd/VBoxLinuxAdditions.run</code>
  - Restart your virtual machine in order to reload the kernel modules<code>systemctl reboot -i</code>
  - If you want the VM to automatically switch to full screen upon boot or login, toggle the **View option --> Auto-resize Guest Display**
  - Uninstall the guest additions<code>sudo sh /mnt/VBoxLinuxAdditions.run uninstall</code>
  - Repeat steps 3-6 if the kernel or the VirtualBox version changes
  * [[https://kifarunix.com/install-virtualbox-guest-additions-on-debian-11/|Install VirtualBox Guest Additions on Debian 11]]