Re: [gentoo-user] Re: grub error I've never seen in many installs

[Hinnerk van Bruinehsen]

On Wed, Jul 12, 2017 at 05:57:58PM -0400, Harry Putnam wrote:
> Arve Barsnes <arve.barsnes@×××××.com> writes:
>
> > On 10 July 2017 at 22:06, Harry Putnam <reader@×××××××.com> wrote:
> >
> >>  grub-install /dev/sda Installing for i386-pc platform.
> >> grub-install: error: cannot find a GRUB drive for /dev/sda1.  Check
> >> your device.map.
> >>
> >> Where might I find `device.map'... it isn't part of grub2.  At least
> >> grep doesn't find it with `qlist grub'
> >>
> >
> > As far as I understand it, grub2 will dynamically create the device.map
> > when it needs it, so it doesn't actually exist as a file. On my grub legacy
> > system it is installed as /boot/grub/device.map, with the only contents
> > being "(hd0)   /dev/sda".
> >
> > How you would feed grub this information *before* it is installed I'm not
> > sure, but maybe look into the USE=device-mapper flag, maybe it installs the
> > grub-mkdevicemap executable.
>
> Yeah, I tried that before posting.. setting USE=device-mapper then
> reinstalled grub2... same result as without the flag.  Same error
> message.
>
> I've always .. on many installs (over time) and mostly into a vbox vm,
> created a disk, then when booting the install media I carve it up with
> fdisk.
> /dev/sda1=boot
> /dev/sda2=swap
> /dev/sda3=home
> /dev/sda4=/
>
> Has something changed regarding using that kind of technique?
>
> I can't figure out why grub would be looking for a GRUB drive on
> /dev/sda1 as the error says:
>
>   grub-install: error: cannot find a GRUB drive for /dev/sda1


Did you mount /boot from inside the chroot environment? IIRC I got a
similar failure when mounting /boot from outside the chroot...