The UEFI system requires a FAT partition for boot loading and I have not tested whether this partition should just come along for the ride during the cloning copy steps. I have not attempted it on a UEFI system.
I should qualify this here importantly for cloning, not importantly for just doing update-grub: I have done this on BIOS systems only. You can take what you need from it if you are not cloning, and your process will be simplified. Also this method was discovered through searching in the context of cloning. I mention cloning here extensively, because in a sense the update-grub step is a subset of it and the approaches have the same basis during a live session. It is "required" (there may be other methods but knowing this one, I don't care about them at all) if you clone your drive and have already installed the new one in the computer. You can do update-grub from a live CD on an installed Ubuntu Distro (although I assume this works with any linux distro.
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