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I'm using the newest version of Ubuntu, and I set my GRUB timeout to 0 and the default to start Windows. Now I can't access GRUB or boot Ubuntu. Holding shift does not work when the timeout is set to 0.

How do I boot into Ubuntu?

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Hold down the 'shift' key as the machine boots. The grub menu should show.

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It doesn't work. – Nicolay Doytchev Jun 27 '13 at 19:06

Boot from a live Ubuntu and role back what you have done. You need to change the /boot/grub/grub.cfg. Be careful about the path, When you use a live CD partitions are not mounted by default.

for more information have a look at this thread

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