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So I have a dual boot setup using Windows 10 and Linux Mint 17.2 but I can't boot into Mint normally because my laptop always boots into windows without showing grub.

In order to boot into Mint I have to hold F12 while booting, select my HDD and then select 'ubuntu' or 'Ubuntu' from a list of items, which brings me to grub. From there I can boot into windows and mint.

How do I fix this? Using boot-repair didn't work and neither did reinstalling Windows or Linux.

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use a live linux CD or DVD I suggest Ubuntu live and repair the grub or reinstall it.

mount the Mint partition to /mnt

and then:

sudo grub-install --root-directory=/mnt /dev/sda(the suitable based on your partition table) 

check it with the below command to find your Mint partition:

fdisk -l

and then :

update-grub
  • First of all thank you for the fast response. ok I tried this and during sudo grub-install --root-directory=/mnt/dev/sda8 it gives me the following error: grub-probe: error: failed to get canonical path of '/cow'. Installing for i386-pc platform. grub-install.real: error: install device isn't specified. – NDTS Sep 1 '15 at 18:35
  • And if I mount the boot partition to /mnt I can see a folder named 'ubuntu' inside /mnt/dev/sda2/EFI. What if I delete it and install everything again? – NDTS Sep 1 '15 at 18:38
  • @NDTS for the grub-probe error try this one : mount --bind /proc /mnt/proc mount --bind /dev /mnt/dev mount --bind /sys /mnt/sys chroot /mnt grub-install /sd# yours seems 8 update-grub – F.sb Sep 1 '15 at 19:38
  • OK so I fixed it by deleting the Ubuntu folder in /dev/sda2/EFI and then reinstalling grub with boot-repair from a live usb – NDTS Sep 1 '15 at 20:16
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I'm not an expert, but I have observed that, if you don't turn off the fast boot feature of windows 10 before installing linux, these types of complications occur.

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