[ubuntu] Macbook unable to boot from live-CD?

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http://ubuntuforums.org – Hi! I have encountered a problem while trying to dual boot Ubuntu on a Macbook 5.2. I followed online instructions and installed rEFIt, partitioned using Boot Camp, but when I boot from the live-cd, I only get to the main menu. When I choose an option it freezes, and I have tried with different live-cds, including other Linux distributions, but so far they all freeze at some point. What could be causing this? Thanks for any help! Jimmy (Hardware)