Here's the big question on my mind: why can I not go on Amazon right now and buy an Ubuntu laptop? There is one I have seen (and I have searched for a while), where someone is reselling used laptops with Ubuntu installed.
There are so many device makers out there trying to replicate the feel of a MacBook Pro with Windows. Seems like it would be easier with Ubuntu. The success of Apple sprang mostly from marketing and differentiation, it could happen to Ubuntu with a little motivation.
If you're looking for a Ubuntu preloaded laptop, you can take a look at System76 ( http://www.system76.com ). They only make Linux computers (laptop/desktop/server), though they don't sell through Amazon.
The main point was the "from Amazon" part. It really seems like the largest online retailer would have some company, no matter how big or small, selling Linux laptops.
There are so many device makers out there trying to replicate the feel of a MacBook Pro with Windows. Seems like it would be easier with Ubuntu. The success of Apple sprang mostly from marketing and differentiation, it could happen to Ubuntu with a little motivation.