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

[haobinnan]

> If you have a specific issue in the code we ship rather than a generic
"X doesn't work on my downstream build of your stuff", I could be more
amenable.

The Ubuntu version is likely to encounter this issue as well, so I hope
it can be addressed.

> It is not a special restriction, the UEFI stub loader simply does not
support mixed mode, which we have switched to. There is a fallback to
the legacy loader which might work, but that is on purpose disabled when
NX enforcement is required.

While it's true that mixed mode is no longer supported, there are indeed
scenarios where this is needed. Could we add support for this in the
Ubuntu grub2 code?

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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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