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

[Pascal Hambourg]

Le 11/12/2018 à 00:21, David Collier a écrit :
> On Mon, Dec 10, 2018 at 2:36 PM Pascal Hambourg <address@hidden>
> wrote:
>
> > Le 10/12/2018 à 22:59, David Collier a écrit :
> > > I copied the script below to the SSD /etc/grub.d  directory and ran
> > > update-grub, and verified that the menu shown when booting comes from
> > > this grub instance.
> >
> > This is not what I am asking for. What about the GRUB bootloader itself
> > (boot image and core image) ? Did you run grub-install ?
>
> ah, no, I did not, will try tonight.

No, don't change anything yet. Investigate first.

> > > > For now, the only explanation which comes to my mind is that the active
> > > > GRUB is not GRUB EFI but GRUB BIOS, which expects to chainload a boot
> > > > sector with AA55 signature instead of an EFI executable.
> > >
> > > is there any way around this?
> >
> > First, check what GRUB flavour is running.
> > Type "c" at the GRUB menu to enter GRUB shell and type "set" to print
> > environment variables. One contains the target architecture efi or pc.
>
> will do and report here, thank you for your help,

Variables of interest are :
cmdpath
grub_cpu
grub_platform
prefix