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

From: Pascal Hambourg
Subject: Re: 'error: invalid signature' when booting Windows 10
Date: Thu, 13 Dec 2018 20:52:23 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:60.0) Gecko/20100101 Thunderbird/60.3.0

Le 13/12/2018 à 07:49, David Collier a écrit :
On Wed, Dec 12, 2018 at 10:22 PM Pascal Hambourg <address@hidden>

Isn't there a labelled boot entry for GRUB/Linux in the EFI boot menu ?

no, there is not, GRUB/linux is booted when "P1: Samsung SSD 850 PRO 1TB"
is picked.

Is there a line in /etc/fstab to mount the EFI partition on /boot/efi ?

no, there is no line in /etc/fstab and there is no /boot/efi in the mount
command output

Is there a GRUB instance in (/boot/efi/)EFI/* on the EFI partition ?

i.e. /boot/efi is empty

/boot/efi is a mount point for an EFI partition. If the EFI partition is not mounted on it, it appears empty. Add a line in /etc/fstab to mount the EFI partition /dev/sdb3 by UUID (from blkid) as vfat on /boot/efi and mount it.

Is there a directory /boot/grub/x86_64-efi ?

no, but there is  /boot/grub/i386-pc full of GRUB modules

These are GRUB PC modules. So GRUB EFI was not installed on this system.

You must install GRUB EFI for the architecture matching your UEFI firmware (32 or 64 bits, most likely 64 bits - NOT the CPU architecture), but grub-install will be able to register an EFI boot entry for itself only if the system was booted in EFI mode. What is the installed distribution ? The installer of some distributions provide a rescue mode which allows to chroot the installed system. Also you can boot a live system in EFI mode and run grub-install from there using the proper --boot-directory and --efi-directory options. Or you can boot the installed system in EFI mode with something like GRUB Rescue.

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