Once you've installed Ubuntu's Gutsy Gibbon, follow these steps at PCWorld to avoid headaches and make your new OS feel like home.
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Add DVD Support
For legal reasons, Ubuntu lacks a small system library that decrypts the video on most commercial DVDs. The system's default media player isn't quite DVD-ready, either. Luckily, everything we need to play our DVDs is easy to fetch and install, though not quite as easy as the typical point-and-click dance for software installation on Ubuntu.