Need help with EFI

[mr_raider]

Sorry to necro an old thread but I need some EFI help. I managed to install kubuntu and Mint to different btrfs sub volumes, @kderoot, and @cinroot. However to switch between one and the other, I need to edit the /boot/efi/EFI/ubuntu/grub.cfg file.

this line

search.fs_uuid c977f168-f448-4f19-bef7-623146e19c6b root hd0,gpt3 
set prefix=($root)'/@kderoot/boot/grub'
configfile $prefix/grub.cfg

Needs to be changed by swapping @kderoot with @cinroot.

Is there a more elegant way to do it?

[SteveRiley]

Elsewhere on the forum here, our intrepid member Oshunluvr has explained how he maintains a "master" GRUB in a small partition. Then each partition containing an operating system has a dedicated GRUB just for that operating system. The master GRUB displays the list of available operating systems; choosing one hands off boot responsibility to the appropriate dedicated GRUB.

This approach may work for you.