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

[Mate Kukri]

> 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.

Can you actually verify that this is the case with the _Ubuntu_ shim +
_Ubuntu_ GRUB build? As I said, it's not our job to support downstream
builds. The shim+GRUB+Windows all have to be 64-bit for this to work of
course.

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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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