This will mark the Ubuntu kernel as valid, so it will continue to boot next time.

If something went wrong and Ubuntu crashes or you powered off, the tries field for KERN-C will have been decremented to 0 and you'll fall back to booting Chrome OS.Īssuming that Ubuntu booted and you could log in, go to Applications->Accessories->Terminal to get a shell, and run If you reboot now, you should come up in Ubuntu! Note that Computer Science Standard Answer #1 applies: It Works For Me™ That way if it doesn't work, we're not completely stuck. This makes KERN-C the highest priority, but only gives us one chance to boot it. Let's change the priority of KERN-C to 5: The successful field overrides the tries field, but is only set by the OS once it's up and running. The tries field is decremented each time the BIOS tries to boot it, and if it's zero, the kernel is considered invalid (this lets us boot new images without looping forever if they don't work). The priority determines the order in which the BIOS tries to find a valid kernel (bigger is higher, zero means don't even try). Run cgpt show /dev/sda, to see the kernel priorities: The image priority is an attribute of its kernel partition. Next, we adjust the priority among the images so we can try out our Ubuntu image. Image-C is Chrome OS kernel with a modified command line and an Ubuntu rootfs, which can only boot in dev-mode.Image-B is (or will be after the first autoupdate) another official Google Chrome OS which can boot either in normal mode or dev-mode.Image-A is an official Google Chrome OS which can boot either in normal mode or dev-mode.EDIT I: Set boot priorityĪt this point we should have the following situation: Changing it back to Chrome OS is as easy as disabling developer mode when you boot the Chromebook, or entering sudo cgpt add -i 6 -P 0 -S 1 /dev/sda at the terminal. If you'd like ChrUbuntu to be the default, open up the Terminal in ChrUbuntu (or the Developer Console command prompt in Chrome OS) and enter sudo cgpt add -i 6 -P 5 -S 1 /dev/sda to change the default boot partition. Once you have installed Ubuntu, if you reboot your Chromebook, by default it will continue to boot into Chrome OS, which lives on in its own dedicated partition.

Ubuntu on chrome book