I have dual booted my machine. First I had installed Windows 8.1, and then I have installed Ubuntu 14.04.03 version. I had switched off secured boot and power boot options . Now when I boot my machine, Windows boot loader directly starts the Windows 8.1, and I am not getting the GNU Grub option where I can select the OS to be booted. I need to press F9 and select the boot loader and then I am being directed to GNU Grub. Now how can I resolve this issue so that GNU Grub loads by default and I do not need to press F9.
A other idea would be to enter the UEFI and change the boot order.