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Ok.I have windows 10 installed on my computer by default, and I have followed the advice of this post. When I have the 2nd disc (disk? If you can answer that question too that would be great :P) plugged in, it works fine. However when this disc/k is not attached, I simply see a grub console. I understand that the first stage of grub gets installed there, my question is how can I make it boot directly to windows 10?

Thanks for your time,

Ben

N.B. My apologies if this is a duplicate, but to the best of my ability (not much) it is not. Also, please right your answer very simply, as I am not very clever.

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It seems you have a mix of UEFI and Legacy installs:

  • => Windows 7/8/2012 is installed in the MBR of /dev/sda. => Windows 7/8/2012 is installed in the MBR of /dev/sdb.

and at the same time an apparently normal ESP (EFI system partition) for Windows/Linux dual boot.

Ubuntu is installed in sdc (not "drive K" - Windows own terminology is irrelevant here), the 2TB HDD, but in UEFI mode you should boot from sda, the 120GB SDD(?). Make sure you have set the correct boot device at UEFI and then:

  1. You can choose the Windows bootloader as the default in the settings -> Boots directly to Windows; or
  2. You can choose Ubuntu -> Boots to GRUB menu from where you can boot Ubuntu or Windows.

If option 2 boots directly to Ubuntu, open a Terminal, input the following command and reboot:

sudo update-grub