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I just removed windows from my laptop completely. I will install it on virtual box. My question is now, how and from where do I edit the boot options to boot directly in Ubuntu after I open my laptop without passing through the boot options page or if this is not possible, how do I remove the Windows boot line from there?

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Try this: Hit (Alt+Ctrl+T) to open terminal and run this command: sudo update-grub. – Basharat Sialvi May 29 '12 at 1:15
Uuuups :D indeed. After updated from terminal, windows boot option gone. Thanks. – Dave May 29 '12 at 1:19
up vote 1 down vote accepted

You can edit grub to don't wait any second (instead of 10 seconds) and boot the first option in the menu:

1) Alt + F2 and paste gksu gedit /etc/default/grub

2) Search for the line "GRUB_HIDDEN_TIMEOUT=10" and change it to "GRUB_HIDDEN_TIMEOUT=0"

3) Open a terminal and paste: sudo update-grub

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