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Troubleshooting Virtual DICE

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Virtual DICE has its share of quirks and oddities, listed below. If you encounter a problem which isn't listed here please get in touch.

  • Logins to Virtual DICE may hang if the host machine goes on (or off) the network after the VM boots - so if for example you boot the VM while the host is not on the network, keep the host machine off the network until you have finished using the VM. If a fix is found for this problem it will be advertised here.
  • USB support is disabled because it depends on the VirtualBox Extension Pack, which we're not allowed to redistribute. If you need USB support look for the VirtualBox version Oracle VM VirtualBox Extension Pack in the Downloads section of It's released under Oracle's Personal Use and Evaluation Licence. Once installed, enable USB support for your virtual machine using VirtualBox Settings.
  • On Debian Linux we found that VirtualBox's Import Appliance dialogue only showed the available .ovf files, making it impossible to choose the Virtual DICE .ova file. However, double-clicking the .ova file still resulted in it being successfully imported into VirtualBox.
  • The guest account can be used from anywhere, but to log in successfully using your DICE account, your computer must be on the University network. This can be done using one of the University VPN services.
  • If VirtualBox gives the message VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot - then you either need to enable hardware acceleration (or "virtualization technology") in your computer's BIOS, or disable hardware acceleration for Virtual DICE. To enable hardware acceleration on a PC, reboot it and enter the BIOS settings, and enable anything labelled Virtualization or VT for Direct I/O or similar. Save your settings and reboot, then try Virtual DICE again. Failing that, disable hardware acceleration in VirtualBox - highlight the Virtual DICE VM but make sure it is not running; click 'Settings' then 'System' then 'Acceleration' and untick ‘Enable VT-x/AMD-V’. Click 'OK' to save that setting then try Virtual DICE again.
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