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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: Fri, 14 Dec 2018 20:30:36 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:60.0) Gecko/20100101 Thunderbird/60.3.0

Le 14/12/2018 à 07:51, David Collier a écrit :
On Thu, Dec 13, 2018 at 10:35 PM Pascal Hambourg <address@hidden>

Le 14/12/2018 à 06:13, David Collier a écrit :
when I try booting from the usb stick it indeed shows two boot options,
'Patriot Memory PMAP' and 'UEFI: Patriot  Memory PMAP' but when I try
picking the UEFI option it fails with message

error: file '/boot' not found

Is this a GRUB error ? Does it fallback to a grub rescue prompt ? If
yes, what do the 'set' and 'ls' commands display ?

ah, it turns out it is. set shows a screenful of variables, in particular


At least it's booted in EFI mode (64 bits).
Partition #2 on the USB stick is the EFI partition.


Is it a normal "grub>" prompt will full features or a "grub rescue>" prompt with limited capabilities ?

If this is the normal "grub>" prompt, you should be able to manually load the config file from your installed system and boot the system in EFI mode.

insmod part_gpt
insmod ext2
set root=hdX,gpt3
configfile /boot/grub/grub.cfg

You'll have to find out which (hdX) is the /dev/sda drive which contains the system root partition.

ls shows a bunch of drives, some with partitions, some without.

'ls' shows the partitions on a disk only when the module handling the partition table type (part_msdos, part_gpt...) is loaded. By default only required modules are loaded.

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