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I noticed that whenever I try to select "Windows 10" from the grub boot screen, it turns black and then returns to Grub.

This happened after I upgraded Ubuntu 16.04 LTS to 18.04 LTS. I should note that I triple boot with Mac OSX High Sierra and chainload Clover from Grub. I also noticed that Clover does not detect Windows 10 as a bootable option anymore.

Does anyone have any ideas as to what is going on?

I have tried:

  1. sudo update-grub
  2. boot-repair

Nothing seemed to work. Any ideas?

Here is my boot-repair pastebin http://paste.ubuntu.com/p/jrzcMYk9WG/

Thanks!

  • Have you tried using boot-repair yet? – WinEunuuchs2Unix Sep 16 '18 at 20:40
  • Yes, boot-repair does not fix the issue. Here is my pastebin: paste.ubuntu.com/p/jrzcMYk9WG - The issue is that when I select Windows 10, the screen goes black and immediately goes back to the GRUB screen without any error. – coolcatco888 Sep 16 '18 at 20:55
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    It looks like you somehow overwrote the first sector of your Windows partition with an instance of Grub. You will need a Windows DVD to repair your Windows installation. – mook765 Sep 16 '18 at 21:28
  • I've tried bootrec /fixboot and that does not work. It gives me access denied. I still have the same problem only now it says, "GRUB LOADING" before returning back to grub. How do I repair my first sector of my Windows Partition? – coolcatco888 Sep 17 '18 at 5:51
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I managed to get Windows to boot!!!

Ok here is what I did to fix it:

  1. I launched a Windows Installer USB and entered the command line
  2. I ran bootrec /rebuildbcd to fix my BCD then
  3. bootsect /nt60 C: /force <-- This clears GRUB from the NTFS Boot sector
  4. Then GRUB couldn't boot Windows, it just went to a black screen with a DOS cursor
  5. To fix this I had to add: ntldr /bootmgr after chainloader +1 in my /boot/grub/grub.cfg

The GRUB fix is here: *Grub* Windows 10 doesn't start anymore

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