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

[Mate Kukri]

This is a bug tracker for Ubuntu users, not an upstream support forum. I
will verify that dual-booting Ubuntu and Windows works or not, beyond
that I don't think I can do much more.

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.

> Regarding "64-bit Linux kernel on 32-bit UEFI," I think the grub2.12
code has implemented some special restrictions

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.

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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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