I have Ubuntu 12.04 installed on my Acer C7 chromebook. Once I installed it, I never switched back to Chrome OS. But yesterday when I got back home, I found that my laptop LED was on, and the Chrome OS was running. How can I go back to my Ubuntu 12.04? I usually had a screen that has a chrome logo on it every time I turn on my laptop, where I always pressed Ctrl+D to run Ubuntu, but this screen no longer appears when I boot.
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The solution was ever easier than I could imagine. The first thing one should do is to enter developer mode, then log in as "Chronos" and enter:
sudo cgpt add -i 6 -P 5 -S 1 dev/sda
exit
... and reboot. This should make Ubuntu your default system. Special thanks to you mr Marc for your help!