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Not being able to install Ubuntu is a particularly unhappy problem because it means that you've probably been denied all the fun from the previous 20 chapters of this book! Never fear; there's plenty you can do to convince Ubuntu to install itself on your computer, and if you're still struggling, you can try alternative installation methods like booting from a USB stick, which I've covered in Appendix A.
If you tried to start your computer from the Ubuntu installation CD but never even got to the purple boot screen (see Section 2.1 in Section 2.1) or if the computer just boots into Windows every time, try one of the following options: