Dualboot win10/Linux Mint boots directly into win10 - doesn't show grub

Question

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.

Solution

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

Comments

[NDTS]

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]

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?

[FargolK]

@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