1

G'Day; I have Ubuntu 15.10 on one partition and Ubuntu Mate 15.10 on another partition, is there some way I can choose which grub boot loader is used, I want to use the Mate bootloader..

2

Serg is (sort of) correct. If the output of cat /etc/fstab includes a line that mentions /boot/efi, you're booted in EFI mode (proceed to EFI). If it says something like "not found", or just outputs nothing, you're not in EFI mode. (proceed to BIOS)

EFI

This will be a list of commands to run, run them from top to bottom:

sudo grub-install --efi-directory=/boot/efi --bootloader-id=ubuntumate --target=x86_64-efi --recheck --debug

sudo grub-mkconfig -o /boot/efi/EFI/ubuntumate/grub.cfg

(I don't know if boot/efi/EFI/ubuntumate will be the path where GRUB is installed, you may want to do sudo ls /boot/efi/EFI and figure out if it's in GRUB or ubuntumate)

BIOS

Do sudo grub-install /dev/sda

0

Boot from Mate and run

sudo grub-install /dev/sda

Reference : https://unix.stackexchange.com/questions/154940/set-which-grub-loader-to-use-after-dual-booting-two-linux-oses

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