No boot after Boot-Repair-Disk

[gold_finger]

Thanks for the output.  Mint Mate is the first root partition, so it looks like that is what Boot-Repair uses when faced with multiple distro systems.

Just for future reference, if you ever decide to eliminate LL and want booting to be controlled by Mint again, boot into Mint before deleting LL and enter this in a terminal to take back control of booting:

Code:

sudo grub-install /dev/sda

That way you switch control back beforehand instead of having to use a "live" DVD (or Boot-Repair) after the fact.

Also, if you install other distros to the drive and don't want to mess up LL's control of booting, just make sure you point the installation of boot loader for the new distro to the new distro's Root partition instead of /dev/sda.  After install, just boot into LL again and use following terminal command to update the grub menu to include the newly installed distro:

Code:

sudo update-grub

I don't use Grub Customizer, so can't give any guidance on how it works.  Maybe N4RPS or others can give pointers for its use.