Grub doesn't appear after windows 10 upgrade


After a Windows 10 upgrade I'm not able to choose what operating system I want to boot, (I have installed Windows 10 and Ubuntu 14.04 LTS) because Windows 10 starts automatically. I created a live USB with the latest version of boot repair disk and I ran the recommended repair option but it did not work. Here you can find the output from BootInfo:

http://paste.ubuntu.com/16953932/

Any ideas?

---------------Answer---------------

Almost the same situation as mine. I have Windows 10 along side Ubuntu 16.04 LTS. I also have dual boot system with bootloader as grub. I faced the same issue i.e. after latest Windows 10 update - the computer will not show the grub screen and then directly boot into Windows 10. I cannot go into Linux at all.

This is what I did. Once booted inside Windows. Press Windows + R or right click on Start menu to get run command. when you are typing run.exe select as run as administrator. Once you are in command shell kind of windows type this command:

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

Make sure that command executed successfully. Your command could be slightly different - please refer to your initial grub install/config logs for the correct command. It worked for me and I believe it will work for anybody else.

Note: This will work when you upgrade Windows 10 within Windows 10.

---------------Answer---------------
sudo fdisk -l

sudo mount /dev/sda1 /mnt

sudo grub-install --root-directory=/mnt/ /dev/sda

Note SDA is not the specific partition but the entire HDD like sda, sdb


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