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I have a problem with booting Windows 10. I use Windows 10 and Ubuntu 14.04 and first I instantly got back to GRUB when selecting Windows 10 then I booted from Windows 10 installer media and ran following commands:

bootrec.exe/fixmbr
bootrec.exe/fixboot
bootrec.exe/scanos
bootrec.exe/rebuildbcd

I reinstalled GRUB and now I don't get back into GRUB after selecting Windows 10 but I get a blackscreen showing _ and Windows does still not boot.

After I executed bootrec.exe/scanos I got the following message:

The searching after Windows-installations was successful. Number of identified installations: 1 [1] C:\Windows.old\Windows (sorry for bad translation)

Notice: I have updatet from Windows 7 to Windows 10

For me it looks like Windows does not consider the current OS but I can't think of anything that could help.

Any ideas?

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14
  • You can try using the free EasyRE repair CD for Windows 10: neosmart.net/easyre - it's a bootable CD so you might have some luck with it. But if you don't have an OS in C:\ and only in C:\Windows\ that probably means setup never finished.
    – Mahmoud Al-Qudsi
    Aug 27, 2015 at 15:04
  • Well I already used Windows 10 a few days and I can't remember what happend that it doesn't boot any longer. But the system worked and should work
    – Phile Reinhardt
    Aug 27, 2015 at 15:07
  • Try the CD, then.
    – Mahmoud Al-Qudsi
    Aug 27, 2015 at 15:08
  • any danger to lose data?
    – Phile Reinhardt
    Aug 27, 2015 at 15:10
  • No, not really.
    – Mahmoud Al-Qudsi
    Aug 27, 2015 at 16:37

3 Answers 3

Reset to default
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See here: According to what Nicholas said:

I just had to run this in windows: bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi Grub appears fine on boot and I can boot into Ubuntu and Win10 fine.

this solved my problem.

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  • but in this case it is a different problem. Do you really think it also solves my problem? And if it does.. I don't use UEFI, what would be the path for a BIOS system?
    – Phile Reinhardt
    Aug 27, 2015 at 14:30
  • as u siad The searching after Windows-installations was successful. Number of identified installations: 1 [1] C:\Windows.old\Windows (sorry for bad translation) change it to C:\Windows it tries to search for the Windows in windows.old
    – Syed Ali Naqi
    Aug 27, 2015 at 14:31
  • just that I don't make any mistakes in my case it would be bcdedit /set {bootmgr} path C:\Windows as normal command? or do I have to replace anything? sorry but normally I don't work with Windows commands
    – Phile Reinhardt
    Aug 27, 2015 at 14:39
  • yeah that is right
    – Syed Ali Naqi
    Aug 28, 2015 at 10:50
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On my netbook I have dual-boot Windows 10 and Ubuntu 15.4

BCDedit is the best to make a bootable menu for the MBR Windows boot.

Grub Customizer installed in Ubuntu to make a boot menu for GRUB.

GRUB in my case is placed in the Linux ext4 partition, while the MBR is original Windows. The two menus are completely chained. As soon as I get home I can write more details, if this will be of any interest to you.

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I think it is a good idea to look here (http://www.howtogeek.com/114884/how-to-repair-grub2-when-ubuntu-wont-boot/).
Boot into Ubuntu live and try to install grub on all drives Place Grub in all disks. and there is a great chance that it should fix booting problems (since you are overwriting any boot sectors that existed and in other words you are removing them)
Well I decided to put some portion of that link here:

  1. Boot into Ubuntu Live CD and put these lines into terminal
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair
boot-repair
  1. Then Grub Boot Repair GUI is installed. enter image description here enter image description here

Well, I think the second option in first image Create a Bootinfo summary (to get help by email or forum) is a good choice for making it clear what really happened to your computer! You can post what it says there here to inform us.

Hope this helps.

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  • you mean I shall install GRUB in the Ubuntu and Windows partition? Because later on it is asked again
    – Phile Reinhardt
    Aug 27, 2015 at 15:02
  • yeah, both. BTW i encourage you to create a backup of your important data using ubuntu live cd. At least you would have the option to reinstall Windows and ubuntu again.
    – Amir Hossein Baghernezad
    Aug 28, 2015 at 14:27
  • I don't think there is a problem with GRUB or chainloading. I think the problem is that Windows itself doesn't consider a bootable OS
    – Phile Reinhardt
    Aug 28, 2015 at 14:57

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