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I recently installed Ubuntu 13.04 Desktop (x64) onto my Windows 8 machine. Ubuntu loads fine however, on the boot menu when I select boot Windows 8 it comes up with a series of errors:

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I also have the error message KMV disabled by BIOS when I boot Ubuntu (though that does boot successfully afterwards).

I have heard something about secure UEFI but I do not know what that is really or how t should be disabled (if that is the issue).

My computer is a Lenovo IdeaPadZ500.

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Two separate issues may be at play here.

  1. Your UEFI boot entry for Windows may be incorrectly generated. It is a known issue: update-grub generates only BIOS based menu entries for Windows, even on UEFI systems. There are several ways to fix the problem; follow the quoted thread to see which one you would prefer.

  2. Secure Boot prevents Windows 8 from being loaded from Grub2 on dual-boot systems: Unable to chainload Windows 8 with Secure Boot enabled. See if turning off the Secure Boot in your BIOS menu fixes the problem for you.

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  • I have disabled secure boot and that has left only to errors “can’t find command ‘drivemap’” and “invalid EFI file path”
    – user2521439
    Aug 22, 2013 at 14:13
  • Will the above solution fix it? (or will this tutorial simplehelp.net/2013/07/10/…)
    – user2521439
    Aug 22, 2013 at 14:14
  • @user2521439: yes, this should fix your problem. This is yet another way to solve issue (1).
    – Beef Eater
    Aug 22, 2013 at 15:07

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