Ubuntu 12.10 and 13.04 cannot automatically restart after installation.
Virtual Machine hangs with the following messages:
The system is going down for reboot NOW! <info> Caught signal 15, shutting down...
- Click inside the Virtual Machine window
Virtual machine will switch to another screen with a following message:
Please remove installation media and close the tray (if any) then press ENTER:
Ubuntu Virtual machine will then reboot.
Known issue for Ubuntu 12.10 and 13.04 reported in Ubuntu Bug #1183212