Re: 'error: invalid signature' when booting Windows 10

[David Collier]

On Thu, Dec 20, 2018 at 11:24 AM Pascal Hambourg <address@hidden>
wrote:

> Le 20/12/2018 à 17:21, David Collier a écrit :
> >
> > I added the entry to mount Windows EFI partition, so /boot/efi has the
> EFI
> > directory entry in it now.
> (...)
> > update-grub finds the windows partition now and adds it to the menu. but
> > running grub-install still fails:
> >
> >> grub-install
> > Installing for x86_64-efi platform.
> > grub-install: warning: disk does not exist, so falling back to partition
> > device /dev/sdb3.
> > grub-install: warning: disk does not exist, so falling back to partition
> > device /dev/sdb3.
> > grub-install: warning: disk does not exist, so falling back to partition
> > device /dev/sdb3.
> > grub-install: error: disk `hostdisk//dev/sdb3' not found.
>
> /dev/sdb3 is the EFI partition on the Windows disk, isn't it ?
>

yes


> Does /boot/grub/device.map exist, and what does it contain ?
>

does not exist


> Does it help if you run grub-mkdevicemap before grub-install, or run
> grub-install with --recheck ?
>

running grub-mkdevicemap helped: the map got created and then grub-install
run succeeded,  and  /boot/grub/x86_64-efi/ is now there.

I won't be able to try booting until tonight though, I ran the above
commands remotely.

thank you again for your help!

-dc

> when booting from the USB stick in EFI mode the new menu item boots
> windows
> > successfully, but if I boot from the SSD the same menu shows, but windows
> > does not boot.
>
> The SSD boots GRUB in BIOS mode but the Windows menu entry in grub.cfg
> is intended only for EFI mode, as in your original post.
>
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