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Troubleshooting Virtual DICE

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Virtual DICE has its share of problems. If you encounter a problem which isn't listed here please get in touch.

  • If you can't login to your DICE account, even after ensuring that your computer is on the University network (see Logging in to Virtual DICE) and that the clock is correct in Virtual DICE (see Clocks and time in Virtual DICE), the problem may be that the keyboard mapping is wrong for your keyboard - especially if your computer does not have a UK English keyboard. If this is the case, it's likely that non-alphanumeric characters (e.g. $ \ = < >) in your password are not being typed correctly. In this case, try changing your DICE password to one without such characters - see Passwords or use the password portal. If you still have problems after trying that, please get in touch.
  • The sensa version works with Windows 10, except that you may get delays of up to a minute or two during which nothing appears to happen, especially during the login process or when starting the first shell window.
  • The rezzonico image doesn't work well with Windows 10. Specifically, logins fail because the login process is wrongly trying to contact the School's LDAP servers, and the Windows firewall is blocking these attempts. We're working on a fix for this problem. Until the rezzonico image has been replaced with a fixed image, Windows 10 users might like to try using the previous image. This can be downloaded from:
  • Some functions may not work if the clock in the Virtual DICE VM is not set to the correct date and time. Clocks and time explains how to set it.
  • 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 either by using a University wireless network or by 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. You may find these in the Security section of your computer's BIOS settings. 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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