I've had good success with Thinkpads. Many people mistake the carbon fiber for cheap plastic which it definitely is not. They handle Linux very well and have great durability. I've currently got an X1 yoga 4th gen since they're all metal and I like the premium feel, but I've owned many other Thinkpad devices over the years. The X1 series is what you'd be looking at if you want an ultrabook. As an added bonus, companies buy and sell tons of Thinkpads so there's a good used market.
