How to set your Acer C720 Chromebook to boot to Ubuntu by default.
- Place your closed laptop on a soft surface, upside down.
- Use a sharp knife to cut a hole in the warranty sticker (YES THIS WILL VOID THE WARRANTY).
- Remove the 13 screws with a small phillips head screwdriver (PH1 size works well). Be careful, the screws are very small and will strip easily if you use the wrong size screwdriver.
- Remove the bottom of the laptop by pulling up on it near the hinges. It takes a bit of pressure to remove, but if you lift it from the back (near the hinges) the same way you would open a laptop screen, the hooks won't break (even though they will make a loud snapping sound).
- Remove the BIOS write-protect screw. It is labeled as #7 in this image
- With the bottom off, turn over the laptop and open the screen.
- Plug the laptop in (it must b