C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso
If your guest OS fails to boot (graphics driver issue), you can boot from the Guest Additions ISO itself? No — it’s not bootable. But you can mount it from a recovery shell to uninstall: guest additions iso virtualbox
For automating Windows guest setup:
Open a terminal. You may need to mount the drive manually using sudo mount /dev/cdrom /mnt . Navigate to the directory and run sudo sh ./VBoxLinuxAdditions.run . C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions
Very handy when a kernel update breaks the vboxguest module. adding an unattended install script).
Useful for automated VM provisioning (e.g., adding an unattended install script).