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

[NVieville]

Hello,

Was having exactly this issue: step 7 in the bug description with a
Toshiba Satellite C55-A-11Q laptop. Everything was verified, secure boot
mode on, UEFI boots shimx64, shimx64 launches grub2, correct UEFI
entries (using efibootmgr). Never used boot-repair. The only thing I
made: adding a grub2 menu entry in a new /etc/grub.d/50_win8 file as
suggested in comment #25. But Windows 8 refused to boot from Grub, only
from system setup menu (F12 key).

This was resolved by upgrading the BIOS to the last version (from Toshiba support Web site - e.g. for this laptop from 1.00 to 1.30).
Now the laptop can boot, with secure boot mode on, from Grub menu: Ubuntu, Windows 8, system setup (UEFI) without any problem.

Only my two cents, there is probably a bug in the booting chain, but not
only, some buggy BIOS can let you search for days a solution to this
problem.

Cordially,


-- 
NVieville

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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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