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I followed the mainstream instructions for installing Ubuntu 16.10 alongside windows 10. After installing Ubuntu I restarted my computer to get the GRUB menu to choose which OS to boot. Everything is fine. Booted Ubuntu 16.10 and then I wanted to test Windows as well, so I shut the pc down and turned on again to find the same menu but this time I chose Windows. When I turned it on again, it just ignored grub and went straight to booting Windows.

EDIT: Windows 10 fast start and hibernation are disabled, Secure Boot is disabled; my notebook is a Sony Vaio SVE151J11X

EDIT2: through admin prompt on windows i just ran:

bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi

now everything is fine. Thanks

marked as duplicate by MadMike, George Udosen, chaskes, karel, Zanna Feb 22 '17 at 8:32

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You could try try update-grub, or booting off the live USB or Livecd and running install-grub /dev/sda with the hard drive mounted. This will reinstall GRUB and should check for other operating systems again.

Otherwise, install and use Boot-repair from a live session.

sudo add-apt-repository ppa:yannubuntu/boot-repair

sudo apt-get update

sudo apt-get install boot-repair && boot-repair

check this: Grub2

Or add this to sudo update-grub2

Another option add in /etc/grub.d/40_custom this:

menuentry "Windows" {

set root=(hd0,2)

chainloader +1

}

You might need to twiddle the numbers to get the right partition.

To try the last thing you have to know your Windows 10 parition.

so open bash..

sudo update-grub2

vi grub.cfg

** change the lines I have marked with ** # <--- change this** in your grub.cfg.

and then..

sudo grub-install /dev/sda

  • i did the repair-boot, didn't work. but i edited the question with the solution, thank you! – Pedro Ivo Feb 21 '17 at 17:20

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