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My machine is using Ubuntu 8.04 (=> legacy grub). It is backed up regularly and I would like to check I am able to restore the backup.

This backup includes everything on the system, including /boot (the only things excluded are things like /proc, /var, /dev...).

I "restored" the backup onto an external USB HDD, setup the boot flag there and I would like to boot that. Is that possible ?

I tried several variants of grub-install, changing the menu.lst, but still no luck. For one thing, the /boot/grub/device.map only shows the main HDD, not the USB HDD, is it ok to just add it in there? :

(hd1) /dev/sdb1

When I change the BIOS to boot from USB, it just seems to skip it.

What else do I need to do ?

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2 Answers

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Have you checked grub-install ?

read http://www.linuxselfhelp.com/gnu/grub/html_chapter/grub_3.html

that should get you sorted.

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Thanks for the help... I mentioned in the question : "I tried several variants of grub-install,..." so yes, I've looked into it, but either I am not using it right or this is not the right thing... – Matthieu May 24 '11 at 16:37
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Eventually I got it working by using Plop Boot Manager. I got the tip on the Ubuntu forum (sorry, I don't have the link to the discussion thread here).

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