In my quest to crash Kubuntu, I have succeeded with flying colors.

While following instructions on how to add display modes to xorg.conf, so my display resolution would be 1024×768 instead of just 800×600, I managed to kill Kubuntu!

For some reason, Kubuntu would only display an empty black screen and showed no activity for several minutes. So, I had to edit the VHD to restore the backup xorg.conf file. After that, it loaded just fine.

In 800×600.