Windows 8 and 8.1 Forums

UEFI boot error

  1. #1


    Posts : 8
    Windows 8

    UEFI boot error


    Hi, I have a problem with my EFI boot. Due my university requirements, I had to install Ubuntu 12.10 into my Samsung laptop which came with Windows 8. At the beginning everything went well, but one day I tried to activate the secure boot and when I restart the laptop I got the message "Invalid signature detected, check secure boot policy in setup". So i restarted the pc and inactivated the secure boot, but when I tried to start Windows 8 I got this message "The boot configuration data for your PC is missing or contains errors. File :\EFI\Microsoft\Boot\BCD Error code: 0xc000000f". Since then, I've been trying a lot ways in order to have BCD repaired, but none worked.I tried to do this (http://qliktips.blogspot.com.ar/2012...e.html)Bootrec /fixmbrBootrec /fixboot Bootrec /rebuildbcdbut in the rebuildbcd I got this meesage "the requested system device cannot be identified due to multiple indistinguishable devices potentially matching the identification criteria"also tried Recovering the Windows Bootloader from the DVD - EasyBCD - NeoSmart Technologies Wiki for the nuclear holocaust but when I do this bcdedit.exe /import c:\boot\bcd.temp I got the same above message.I don't know what else to do, I think I've tried everythin, I'd really appreciate if you could help me,thanks!

      My System SpecsSystem Spec

  2. #2


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    Welcome to EightForums.

    How to dual boot with Ubuntu & Windows 8, with Secure Boot ENABLED.
    Practical UEFI Secure Boot (Part 3 of 3) - YouTube

    Samsung Laptops Bricked by Booting Linux Using UEFI
      My System SpecsSystem Spec

  3. #3


    Posts : 1,121
    Windows 8.1 x64


    When you boot your system and go into the bios or look at a Boot Device Menu, what options do you show?

    I assume you still show a Windows Boot Manager, and you have tried that?
      My System SpecsSystem Spec

  4. #4


    Posts : 8
    Windows 8


    I don't know why I wrote Samsung, actually my laptop is an Asus. I'm not sure what do you mean with Windows Boot Manager? I just have the grub menu, and into the bios I just have all hw options
      My System SpecsSystem Spec

  5. #5


    Posts : 1,121
    Windows 8.1 x64


    When you boot, you should be able to get into the bios. You might see an F8 option to open Boot Device menu. Check the attachment and see if you have something like it.

    If all you see during boot is the grub menu, you may want to disable Fast Boot, if so enabled. Also in some cases, starting from a cold boot might help you get into the bios.
    Attached Thumbnails Attached Thumbnails Ubuntu boot - Copy.gif  
      My System SpecsSystem Spec

  6. #6


    Posts : 8
    Windows 8


    actually a I see a something like your picture, but choosing either option, either windows or ubuntu, when I choose windows I still getting the error
      My System SpecsSystem Spec

  7. #7


    Posts : 1,121
    Windows 8.1 x64


    Do you know for sure you installed Ubuntu as UEFI and not Legacy?

    If you boot to the Windows Boot Manager, you should not see the Grub loader.

    I am also a little surprised, if you have the Windows Boot Loader set as first priority in your bios that Windows 8 is not popping up a recovery message.

    Can you still boot your system if secure boot is turned off? If so, there are a couple of Items we could use from your install.
      My System SpecsSystem Spec

  8. #8


    Posts : 8
    Windows 8


    I cannot start windows either with secure boot on or off. Ubuntu was installed in UEFI mode, and I can start Ubuntu normally, but cannot start Windows. When I have Windows Boot Loader as first in priority I don't see grub, but I'm still getting the same error
      My System SpecsSystem Spec

  9. #9


    Posts : 5,360
    7/8/ubuntu/Linux Deepin


    That must be a relief.

    If you really want to be able to boot into 8 again (what for ? ), you could see if boot repair will fix it.

    I think it comes with ubuntu 12.10 - if you don't see it, you can install it :

    from Konsole/Terminal

    -Type:

    sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

    - Press Enter.

    - Then type:

    sudo apt-get install -y boot-repair

    -Press enter

    He should then be under System>Administration>Boot-Repair
      My System SpecsSystem Spec

  10. #10


    Posts : 8
    Windows 8


    thanks, I've already tried with boot repair, all the options it has, but nothing changed, I cannot start windows
      My System SpecsSystem Spec

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