Well, I waited till the weekend so if I needed hours to recover my
system, I wouldn't have to drop the ball on all the other things going
on in my life. And I made sure I had printouts of the instructions on
recovering grub, and grug-efi, using chroot, and that I had a bootable
recent live thumbdrive of Debian. (I only have the one computer, no
fallback.) When I looked, my last version was Debian 9.3....
I had it all laid out, told it to shut down, rebooted, and
it worked perfectly on the first try.
I love Debian.
One curious thing: /sys/firmware/vars/efivars/ still reports itself as
being full. It didn't stop the system from booting. Haven't tried a
manual grub-install. But is that expected behavior?
