First time poster and very newbie so please forgive my ignorance and mistakes.
I was using Linux Mint 18 installed on a 500GB HDD and recently installed LM20 on a 240GB SSD.
Inspecting the partitions I see the EFI partition of LM20-240GB-SSD is empty so it seems to me the way boot works is that the mobo NVRAM directs to EFI in 500GB HDD where GRUB is located and from there I choose LM20 and sent to the LM20 partition which loads LM20.
This works OK but requires both disks to be operational. For now I want to leave the old disk in place just for data and backups but maybe one day I want to remove it or it just fails.
It seems to me it makes more sense and it is safer to have EFI boot-GRUB in the same LM20-240GB-SSD and better do that now, without urgency, than in an emergency.
I have looked around and found https://help.ubuntu.com/community/Boot-Repair
It seems to me that if I just physically disconnect the old HDD and run Boot-repair it will make the SSD EFI bootable but there is a good chance I might lose access to the old disk.
On the other hand, fools rush in where angels fear to tread and I want to be extremely careful and tread very lightly and carefully.
I want to move GRUB from one disk to another and I want to learn more about the whole booting process.
My thought right now is that the EFI partition in the LM20 SSD is empty and unused so I can try to build it into a bootable partition and cannot really do much damage as long as I do not touch any other partition.
So my idea would be to make the LM20 EFI partition bootable and create an entry in the mobo NVRAM pointing to it. This seems to me like least dangerous because if anything is wrong the old boot sequence through the LM18 HDD should still work.
In summary: I want to be able to boot into LM20 without having to rely on the other HDD being present and operational. What is the safest way to go about this?
One last note: I know Linux Mint is not Ubuntu but a derivative but I believe with respect to the problem I am presenting here they are identical.
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