I was multibooting an EFI laptop. The laptop was using GPTs, was using SecureBoot, and it had Windows 8.0, Ubuntu, Fedora and Debian on it.

I updated the laptop to Windows 8.1 through the free App Store update because I could not get security updates and bug fixes for Windows 8.0 and IE 10.

Now, I can no longer access any of the other operating systems. It appears Windows 8.1 blew out the other GPTs during its upgrade, and not just its own GPT. I don't see any other disks under Disk Management; and the EFI's boot screen (not the Windows Boot Menu) does not list any other operating systems.

I have two questions:

  • What happened to the other GPTs and Operating Systems?
  • Is there anyway to undo what this plague known as Windows 8.x has done?

Can you make clear whether SecureBoot

  1. was
  2. is


And obviously, if it was not enabled and if it now is enabled, then reversing it to not using SecureBoot would help.

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  • 1
    This is probably better suited as a comment since it does not provide an Answer (sometimes the community downvotes them, so its a friendly fair warning). To get back to your question: YES, SecureBoot was being used. – jww Jan 7 '15 at 19:19
  • True enough, but yesterday I did not have enough reputation (on Superuser.com) to be able to comment on the original issue. Thanks to you for your friendly warning. – AntoineL Jan 8 '15 at 15:03

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