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I had dual-boot with Ubuntu 14.04 and Windows 10. After last Win10 update, my grub disappeared and I am booting straight to Windows. I wanted to repair it, but I also wanted to update my Ubuntu to 16.04. I updated Ubuntu from USB but it still booted straight to Win. I went to live ubuntu and tried boot-repair, but no luck. I also tried the procedure described here. I did not get any error messages but the system still loads directly to Windows. I have secure boot disabled and I have HDD partition first in boot order in BIOS before Windows Boot Manager. I have also run the bcdedit command in Windows. Any ideas?

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piko
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    That's Microsoft for you! They don't care if they break people's dual-boots. – You'reAGitForNotUsingGit Oct 21 '16 at 12:11
  • Windows anniversary update : deleted ubuntu : no grub then : reallocate memory from disk management : install again – minigeek Oct 21 '16 at 12:33
  • @minigeek Can you elaborate? If I understand you correctly I should put my USB in, choose option "Other", delete the Ubuntu partition, then allocate it again? – piko Oct 21 '16 at 12:37
  • @piko.. windows anniversary update when done online deleted ubuntu or grub (many cases) . check in disk management of windows if there are any Linux partitions available or they are merged with windows disk..if they are not there...then unallocate some disk from it(i m talking about windows) and install Ubuntu into it...if This is not the case then search for installing grub instead of repairing it – minigeek Oct 21 '16 at 12:40
  • If you are trying to repair grub..if ubuntu is deleted..then no point in repairing grub..if ubuntu is not there! – minigeek Oct 21 '16 at 12:43
  • The ubuntu partition is there. I also updated to 16.04 today, but without grub I can't access it. – piko Oct 21 '16 at 12:49

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I was using the wrong file in bcdedit command. The right command is:

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
piko
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  • Are you saying that this fixed your problem? – Rod Smith Oct 21 '16 at 13:16
  • This did not work for me. You could try to use shimx64.efi instead of grubx64.efi. If that does not work either, you need to reinstall GRUB using boot-repair as described here: http://askubuntu.com/questions/226061/how-to-install-the-boot-repair-tool-in-an-ubuntu-live-disc – Krisztián Balla Nov 18 '16 at 16:00