boot – Where would Grub be installed?

This is a follow up and a question branched from this question. In the question, I was asking about how to install portable Ubuntu on an external SSD.

From what I understand from the bug tracker. It says theres an issue that Grub would be installed on first EFI partition no matter user selection. As confirmed later, this seems to be fixed on Ubuntu 23.04.

Therefore, there is no need to manually partition the disk. Instead, I can use “erase disk and install Ubuntu”, which is a more straightforward way to install Ubuntu 23.04.

The question is, if I use the above mentioned method to install Ubuntu to an external disk, where would Grub be written? From the previous question, I understood the EFI needs to be installed onto external SSD for a truly portable Ubuntu installation (that is, Ubuntu can run directly on any computer from external SSD without additional configuration).

I would appreciate any help provided. Thank you.

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