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Thread: Cannot boot Windows 8 using GRUB after reinstalling Windows 8

  1. #1
    Join Date
    Nov 2011
    Beans
    2

    Cannot boot Windows 8 using GRUB after reinstalling Windows 8

    Hello everyone. I have been dual booting Windows 8(The official release of it given to me by my university) and Ubuntu 12.04.1 LTS for about a month without any problems, but recently my Windows 8 install has been having some issues so I decided to reinstall it from scratch. The installation went well, but after reinstalling grub using the chroot method from the liveUSB I have not been able to load up windows 8. Windows 8 has a menu option but when I click it, the blue windows icon shows up, but the spinning circle isn't there and Windows 8 does not boot up... The only way I can get Windows 8 to boot is to use "bootrec.exe /fixboot" and "bootrec.exe /fixmbr" from the Windows 8 cd, but this removes grub... Please help!

  2. #2
    Join Date
    Nov 2009
    Location
    Segur De Calafell, Spain
    Beans
    11,660
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Cannot boot Windows 8 using GRUB after reinstalling Windows 8

    First of all, chroot is not necessary when ubuntu is running fine and you only want to reinstall the MBR part of grub2. You only need to mount the root partition and use that as parameter.

    You might need to run update-grub since the win8 partition was formatted.

    So, from live mode you can reinstall grub with (assuming the ubuntu root partition is /dev/sdaX):
    sudo mount /dev/sdaX /mnt
    sudo grub-install --root-directory=/mnt /dev/sda[/code]

    Note that in the second command you use only /dev/sda without any partition number.

    After you boot ubuntu once, run:
    sudo update-grub

    See if that helps.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 12.04 LTS 64bit & Windows 7 Ultimate 64bit

  3. #3
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Cannot boot Windows 8 using GRUB after reinstalling Windows 8

    Did you turn off the hybrid hibernation feature? Even if dual booting two copies of Windows, you should not use it.

    WARNING for Windows 8 Dual-Booters
    http://ubuntuforums.org/showthread.php?t=1953674
    It defaults shutdown to a hybrid hibernation/off state for fast boot
    But then files may be corrupted similar to Windows 7 Hibernation:
    http://superuser.com/questions/14472...te-w-dual-boot
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  4. #4
    Join Date
    Nov 2011
    Beans
    2

    Re: Cannot boot Windows 8 using GRUB after reinstalling Windows 8

    I have tried this, yet I have come to the same issue. I even tried boot-repair... I really don't know what's going on. It worked before reinstalling Windows :S Looks like I may have to reinstall Ubuntu aswell...

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