Owner of a previous Pixel here. It runs Ubuntu just fine under Crouton. If you're trying to completely wipe out ChromeOS and boot directly into Ubuntu, I believ

Owner of a previous Pixel here. It runs Ubuntu just fine under Crouton. If you're trying to completely wipe out ChromeOS and boot directly into Ubuntu, I believe it's possible. Personally, however, I find ChromeOS to be decent, and I prefer simply popping open Crouton whenever I need a linux-only app. The fact that Crouton can now run in a single tab instead of having to do an environment switch makes it even more useful.