I am running on Windows 8. I had Ubuntu 12.04 running as guest on VirtualBox 4.3.10 r93012 and once I updated it, it began booting into an empty black screen.
I reinstalled the guest additions but it didn't help. This happened to me in the past on multiple occasions which I never learned from.
Is it just wrong to install Ubuntu's updates when running it as a guest OS on VirtualBox?
Or other some best practices (other than backing up the vdi of course)?