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

[Wolle]

Hello Nicolas,

thanks for your reply. Of course I read your comment #31 concerning the
BIOS update... but regarding the fact, that the device is a) not mine
and b) just about 1.5 years old, I have to admit that I'm a little
scared about updating the BIOS and possibly damaging the device. From my
personal experience, flashing a BIOS is not without risk.

My intention was to provide another "case" and maybe more details. The
bug is known for about 2 years now and it seems that nothing has
happened so far, although other distros seem to cope with "imperfect"
BIOS. This worries me a bit. Dual boot is a very important topic,
especially with Ubuntu due to its appealing effect on people that think
about switching from Windows. Sometimes I think, the objectives of
development are a litte unbalanced...

In the end, I prefer disabling Secure Boot to updating the BIOS. The
laptop is intended to be used primarily with Linux (especially dealing
with the internet), while Windows should be a "backup for special
software" only. For me, possible security risks due to disabled Secure
Boot seem less harmful than a) the owner using Windows or b) damaging
the device while flashing the BIOS.

After "boot-repair" totally cracked up everything (no more GRUB,
whatever I did), the machine now runs 14.10.

Thanks anyway
Wolle

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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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