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I re-installed Ubuntu 14.04, but after that I can not boot to my windows 8.1 installation. I repaired my grub but still can not boot windows. Here is my boot repair log.

Can anyone help me with how to add a new menuentry in my grub.d 40_custom file? Thanks in advance.

Tshilidzi Mudau
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Modasser Billah
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  • Try this – George Udosen Dec 23 '16 at 11:48
  • you can try to manually boot windows from startup menu of your computer (not GRUB menu) if you can find some option like run UEFI application in it. Then browse and run bootx64.efi. Once you boot Windows successfully, It will repair the boot sector itself. – pii_ke Dec 23 '16 at 14:52

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A common problem of grub installation not detecting Windows is because of the fast shutdown/resume feature. This stops grub from being able to mount the windows partition to verify that an install is there when it updates. If you reinstall the Windows bootloader, boot windows normally and shut down normally after disabling the feature, and reinstall grub, things should work fine.

Kyle H
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