Comment 3 for bug 31435

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Colin Watson (cjwatson) wrote : Re: "put grub where?"

It couldn't figure out how to boot /dev/discs/disc1/part1 (it identified /dev/sda1 as the corresponding /boot partition, but then couldn't mount it), and so asked grub-installer/bootdev; you'll need to preseed that (to e.g. "(hd0)" for the MBR on the first disk) to make this install proceed noninteractively.

If /dev/sda1 is trashed (e.g. by the current install), then we're done with this bug. If the installer *should* still have been able to mount it, then there's still a bug somewhere, and I'd like to know more about your partition layout.