I want to boot the Win10 installer with
grub chainloading. So I copied the contents of the Win10 iso to an exfat partition (also tried ntfs) on my USB storage device and typed
chainloader (hd0,gpt3)/efi/microsoft/bootx64.efi into the grub shell, but I then get this error:
/EndEntire file path: /ACPI/(a0341d0,0)/PCI(2,1f)/Sata(0,0,0) /HD(1,800,32000,27314ea3b7ee7f43,2,2)/File(\efi\boot)/File(bootx64.efi) /EndEntire
Since I cannot disable secure boot in my BIOS (no option in Security and Boot menu of my Lenovo Ideapad Y580), I then issued the command
set check_signatures=no before entering the chainloader command as suggested here: Grub-EFI: disable signature check, but I get the same error.
Is this a problem with secure boot like here: Windows 8 UEFI does not boot? The error message is quite similar, but it does not say "error: cannot load image" and issuing
set check_signatures=no doesn't help. I don't want to use rEFInd, because I installed GRUB on my USB device to also boot from a Manjaro image.
I post this question because I'm not entirely sure, if this is a problem with secure boot and also
set check_signatures=no doesn't seem to work.