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

[Žygimantas Beručka]

I face the same problem on an Ultrabook Series 5 laptop and confirm that
items 8 and 9 do work as a workaround as described.

However, after realizing this, I started digging into a riddle why
Ubuntu fails to load the 'samsung-laptop' kernel module in the UEFI mode
and actually bumped into bug #1040557, a bug that should have been
flagged 'nuclear' instead of 'critical,' as comment #114 puts it. Hence
I decided to stop at this point for the time being and wait for reports
that it is safe to use Ubuntu on my machine.

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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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