I was in the market for a laptop, and if I am anything, it's a frugal gadget geek. I'm always buying gadgets, but I'm cheap about it.
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I'm happy to report that I was able to get everything working in Ubuntu Linux, with the exception of hibernate. I started with a Gutsy live CD. I did the process the first time with the 32 bit version of Gutsy, then after success, I repeated with the 64 bit version a couple of days later, and both worked fine. The choice is yours. I like having a fully 64 bit operating system, but it comes at the price of not always having access to some applications (like Skype) and more difficulty installing others (like the Java plugin).