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{{ExternalLink|virtualbox|VirtualBox}} is a virtual machine system similar to VMWare, but with an open source version available. It is produced by Sun Microsystems. VirtualBox has been used to produce almost all of the screen shots in this book. The virtual machines used during the production of this book are available for download for those who would like to give MythTV a try without changing the configuration of their existing machine. You can find the virtual machine images available for download at [[Virtual Machine Images]].

To install VirtualBox on Ubuntu, run these commands:

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$ sudo apt-get install virtualbox-ose
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For other operating systems, {{ExternalLink|virtualbox-download|download the relevant version of VirtualBox}} and then follow the install instructions provided by Sun Microsystems.