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I have a simple question concerning Grub. When Ubuntu it's the only system installed on a machine, Grub doesn't appear when the computer it's turned on, my question is: When Ubuntu is the only system, Grub it's not installed on MBR?

I has this doubt when I tried the ASPM command in Grub, to see if it could save some battery on my notebook, and the difference was only 0.4W. I don't even know if it made some effect or it's just a normal oscilation.


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2 Answers 2

up vote 3 down vote accepted

Here is the link to Grub wiki.

Extract from there, from the behavior chapter:

"Initial Default

GRUB 2 will boot straight into the default operating system if no other operating system is detected. No menu will be displayed. If another operating system is detected, the GRUB 2 menu will display."

So, don't worry grub is there.

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Thanks for the answer, bioShark :) –  Dennis Dec 14 '11 at 0:41
Welcome. Glad to help. –  bioShark Dec 14 '11 at 0:44
Hold down shift if you want it to stop and show the menu anyhow, or you can edit the default timeout in /etc/default/grub. –  psusi Dec 14 '11 at 14:38

By default, Grub does not show the list of installed OSes if there is only one installed. However, it still has many entries (such as safe mode and memtest).

To force it show the list (and prove its existence) just press and hold Shift key during the booting process (before the kernel is loaded).

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Thanks for the tip, it's definitely useful. –  Dennis Dec 19 '11 at 4:27

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