I'm trying to install ubuntu on my December 2009 MacBook Pro (15" - 64 bit). I've tried using both the regular AMD64 version and the AMD64+mac version, but neither works. They both boot past the "ISOLINUX" line but then sit at the blinking cursor for at least 10 minutes (I haven't let it go past that, but I have no reason to assume letting it run longer would help). Does anybody know what causes this or how to fix it?