Success! The partition layout is identical to the Cr-48, so these instructions work…
Success! The partition layout is identical to the Cr-48, so these instructions work on the Samsung Chromebook too: http://www.chromium.org/chromium-os/developer-information-for-chrome-os-devices/cr-48-chrome-notebook-developer-information/how-to-boot-ubuntu-on-a-cr-48 but you'll also need to flash the developer firmware as suggested by the login banner after flipping the developer mode switch