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I have a laptop with in-built windows 8. I installed Ubuntu 64 bit via the method shown on this Ubuntu page: https://help.ubuntu.com/community/UEFI

After use boot-repair, in GRUB menu it shows Windows 8 as well. But on clicking it, it shows errors.

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    Welcome to Ask Ubuntu! Could you show the errors? – Lucio Apr 24 '13 at 0:10
  • What is the URL provided by the Recommended Repair of Boot-Repair ? – LovinBuntu Apr 24 '13 at 19:25
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Reporting the precise errors you're seeing might be a helpful diagnostic. Chances are, though, that you haven't broken your Windows; it's probably just a GRUB problem. Some ideas for getting it working:

  • Install rEFInd. Installing the Debian package should set it up properly; however, you might need to do the next thing, too.
  • Disable Secure Boot. Details of how to do this vary from one system to another, but as a general rule, you'll need to enter your firmware's setup utility and look for an option labeled "Secure Boot" to disable it.
  • Create a custom boot entry for Windows, via an entry in /etc/grub.d/40_custom, as shown below. Details will vary depending on where your EFI System Partition (ESP) is, though. After you create this entry, you'll need to type sudo update-grub to update GRUB's runtime configuration file.

The sample /etc/grub.d/40_custom entry is:

menuentry "Windows 8" {
    insmod part_gpt
    insmod chain
    set root='(hd0,gpt1)'
    chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

Note that (hd0,gpt1) must point to your ESP, so it may need to be changed to match your partitioning layout.

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I also got this problem when I installed Ubuntu 64 bit (12.10) and you also like me messed up the Windows 8 boot partition. So now your only options are:

  • Re-install winidows 8
  • Fix the windows 8 boot

See also:

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