Bug#765740: Hope support for multiple ESPs can be upstreamed from Ubuntu -> Debian

[Frank Myhr]

I ran into this yesterday while installing Bullseye on a UEFI system 
with multiple drives and ESPs. Here are a couple of links describing how 
Ubuntu's multi-ESP works:

https://unix.stackexchange.com/questions/621942/mirroring-efi-system-partition-esp-on-ubuntu

https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1466150

I tried running
dpkg-reconfigure grub-efi-amd64
on my multi-ESP Bullseye system in the hope that the Ubuntu support may 
have been upstreamed, but alas it has not yet happened. I'll ask on 
Ubuntu list as well whether someone is working on upstreaming.