I have a dual boot with windows 10 and Ubuntu 14.04 when I boot my PC the windows boot manager shows up and I get the choice between Windows and Ubuntu. The problem is that when I choose Ubuntu, grub shows up and give me the same choice again. This happened since I installed EasyBCD which I later removed. Is there a way to only get grub and not the windows boot manager?
Make sure Windows Fast Boot is turned off. These instructions are for your
CSM boot but you can learn about turning off Fast Boot here: (Installing Ubuntu Alongside a Pre-Installed Windows with UEFI)
On non-UEFI systems or on UEFI systems using CSM (legacy BIOS boot), open the terminal with Ctrl+Alt+T and type:
sudo grub-install --target=i386-pc --recheck /dev/sda sudo update-grub
This will replace whatever boot manager is on the first HDD or SSD. In rare circumstances where you are booting from the second drive replace
From then on if you make changes to grub, do not reinstall but rather from the terminal use:
I had the same issue. First of all change the UEFI boot order by booting into windows and using this tool.
open it and Select "Manage Boot order" shift ubuntu until it is at the top.
Now restart your PC if you have a working grub you will be able to boot into Ubuntu if not use a bootable USB(select try ubuntu option) and type the following commands in the terminal to install a brand new Grub.
sudo grub-install --target=i386-pc --recheck /dev/sda