[Bug 2078307] Re: Grub 2.12 is unable to boot the Windows system using the chainloader /efi/Microsoft/Boot/bootmgfw.efi.

[haobinnan]

I've seen some motherboards with a 32-bit UEFI BIOS but an x86_64 CPU.
On such computers, you can install a 64-bit Linux system, but you must
use bootia32.efi to load the 64-bit Linux kernel in order to boot. If
you use bootx64.efi, it won't boot.

Additionally, GRUB2 also needs to support booting Microsoft's
bootmgfw.efi (using chainloader /efi/Microsoft/Boot/bootmgfw.efi). This
falls under the scope of dual-boot setups, which many users use. GRUB
2.06 works fine for this, but the issue arises because GRUB 2.12 no
longer supports mixed mode.

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https://bugs.launchpad.net/bugs/2078307

Title:
  Grub 2.12 is unable to boot the Windows system using the chainloader
  /efi/Microsoft/Boot/bootmgfw.efi.

Status in grub2 package in Ubuntu:
  New

Bug description:
  I am using Shim 15.8 in combination with GRUB2.12. One of the GRUB
  menu items, chainloader /efi/Microsoft/Boot/bootmgfw.efi, fails to
  boot, while it works correctly with GRUB2.06. Below is a screenshot of
  the error.

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