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Does grub need a boot partition?
The BIOS boot partition is only needed by GRUB on a BIOS/GPT setup. On a BIOS/MBR setup, GRUB uses the post-MBR gap for the embedding the core. For UEFI systems this extra partition is not required, since no embedding of boot sectors takes place in that case. However, UEFI systems still require an EFI system partition.
How do I change from boot manager to grub?
In order to boot windows from GRUB you need to use something called chainloader – GRUB will call windows boot loader (BCD) and then this bootloader will boot windows. If you are using Windows, use disk part, select the disk where GRUB is located, then select the partition. Assign it a letter like S or X.
Why is Ubuntu GRUB2 using the wrong partition?
Here is my issue: Grub2 loads, but seems to be using the wrong config file in the wrong partition. In order to run ubuntu I have to set the root dir to /dev/sda8 and set the proper linux and initrd files which live in /dev/sda8/boot (this is also where the grub.cfg file I want to use lives).
How to fix wrong boot partition in Ubuntu?
So now, open up /boot/efi/boot/grub/grub.cfg with the editor of your choice (e.g. nano or vim ), and replace the UUID part of fs_uuid XXXX-XXXX with your filesystem UUID, for example, in my case, it is 6cea6786-510a-4fba-871b-7811b63b3453
What happens if I boot into a GRUB command prompt?
The worst that would likely happen if you do mess something up is that you’ll get dumped into a GRUB command prompt, where you’ll have to enter the boot commands manually. If you don’t know how to do that, then you might have to boot via a live USB and fix/restore the file.
Where is the grub.cfg file located in Linux?
I have checked it and there is only one grub.cfg file, on the Linux system root partition in the /boot/grub folder. The EFI system partition is being mounted at /boot/efi during boot. With regards to your question about modifying the grub.cfg on the EFI partition: there shouldn’t be any harm in doing that.