[Bug 1091464] Re: Unable to chainload Windows 8 with Secure Boot enabled

[Steve Langasek]

Since this bug was filed, the shim signed bootloader has been updated
several times in Ubuntu.  Please test with a clean install from either
Ubuntu 13.10, or a daily image of Ubuntu Trusty, to check whether this
problem still exists with current versions.

Also, you say the bootloader did not install when you used manual
partitioning, and you subsequently used a third-party tool to configure
the bootloader.  The missing bootloader is probably caused by a wrong
partition "usage" choice, and we can't support the output of the third-
party recovery tool.  Please use the guided partitioner to install
Ubuntu side-by-side with Windows 8.  If there are bugs in that standard
install path, we need to know about them and fix them; and if your
manual install went so badly that the bootloader wasn't installed, we
need to rule out the possibility that the chainboot problem is related
to this.

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https://bugs.launchpad.net/bugs/1091464

Title:
  Unable to chainload Windows 8 with Secure Boot enabled

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  I've been working with Yannubuntu and he suggested I post a bug here.
  Here's what I did.

  Received a brand new Dell XPS13 laptop with Windows8 pre-installed
  with both UEFI and SecureBoot enabled.    After playing around,
  decided to wipe everything and create a dual boot configuration with
  both Windows 8 and Ubuntu 12.10.  Steps:

  1. Install Windows 8 via Dell supplied recovery media in UEFI mode.  The installer will create the /boot/efi, recovery and main partition.  
  2. Use Windows 8 to resize hard drive down to 50GB.  Use the rest for Ubuntu.
  3. Verify the computer boots successfully to Windows 8 with UEFI and Secure Boot enabled.
  4. Boot with USB Ubuntu install media and select 'do something else' to create partitions and indicate /boot/efi
  5. Let the install complete.  Normally here, I run boot repair because the signed bootloader doesn't seem to install.  In boot repair, I use advance options, indicate where the EFI boot should go, primary OS (ubuntu) and select SecureBoot.
  6. Now, everything is configured as I want it.  Upon boot up, the computer will boot to grub and then I can go to either Ubuntu or Windows UEFI.  
  7. Upon selecting Windows UEFI, I get the error:

   /EndEntire
  file path: /ACPI(a0341d0,0)/PCI(2,1f)/UnknownMessaging(12)/HD(2,96800,32000,7c043777b8608641,87,f6)/File(\EFI\Microsoft\Boot)/File(bootmgfw.efi)/EndEntire
  error: cannot load image

  8.  If I swap the order in the BIOS to boot to Windows first (with UEFI and Secure Boot) it directly boots to Windows so I know the EFI boot files are working.
  9. If I go back to my original configuration (e.g. Ubuntu first) with UEFI, but Secure Boot disabled, then the system is able to successfully chainload the MSFT boot files.

  My gut tells me that grub is unable to chainload to an OS (or maybe
  just windows 8) which is expecting a secure boot to be initiated from
  the UEFI bios.

  As a work around, I have disabled Secure Boot, but I'd like my
  ultimate configuration to support Secure Booting to either Ubuntu or
  Windows 8 via grub.

  Thanks,

  Neeraj

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