How to grub-install ignore specific drive/partition

Posted by gsedej on Ask Ubuntu See other posts from Ask Ubuntu or by gsedej
Published on 2012-09-30T20:15:07Z Indexed on 2012/09/30 21:50 UTC
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12.04

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grub2

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usb-drive

Is it possible to use grub-install or update-grub to just search on specific disk/partition? (or ignore specific)?

I installed Ubuntu 12.04 on my hard drive, but i wished to do some testing on it without harming current installation, so I "rsynced" root partition (the only) to the USB partition (ext4). I did fix /etc/fstab on USB partition. The problem is that when I do grub-install /dev/sdb (usb) GRUB seems to confuse when UUIDs. Whatever I chose in GRUB it always boot from disk. In grub in edit mode I see that in two "UUID" lines are not the same. If I retype UUID from "first" to second "line" it boots from USB (as I wish).

Is there any other way than fixing /boot/grub/grub.cfg each time?

EDIT: the GRUB generated good when I booted from USB and grub-install from there, but question is still if it's possible ignore drives

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