Preseeding answer to grub installation disk

Tom H tomh0665 at
Sat Dec 7 11:46:05 UTC 2013

On Sat, Dec 7, 2013 at 12:30 AM, Stephen Wood <smwood4 at> wrote:
> Can someone help me preseeding the answer to this prompt when installing
> the grub boot loader to a disk other than /dev/sda?
> I've tried the following things, but I still get prompted with this question. I'd
> like it to just continue:
> d-i grub-installer/only_debian boolean false
> d-i grub-installer/with_other_os boolean false
> d-i grub-installer/bootdev  string /dev/sdm
> And also
> d-i grub-installer/only_debian boolean true
> d-i grub-installer/with_other_os boolean true
> d-i grub-installer/bootdev  string /dev/sdm
> And also adding:
> d-i grub-pc/install_devices multiselect /dev/sdm
> Regardless of what I add I still get the prompt. Note that /dev/sdm is also where
> the OS installation resides.

The "also" looks like what I use but I haven't done a preseeded
install for a while so maybe something's changed.

Add "DEBCONF_DEBUG=5" to the kernel cmdline and, when your install
stalls, switch to vt4 to find out which preseed variable is needed.

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