I've found that the offending line in /boot/grub/grub.cfg is:
terminal_output gfxterm
Prior to that, my active input and output terminals are set to
"console". If I comment out that line, I can interact with the installed
GRUB over both the serial and VGA consoles, just like with d-i.
I'm not sure what the right solution is. One option is to change:
terminal_output gfxterm
to:
terminal_output --append gfxterm
That makes both "console" and "gfxterm" active. But, maybe it makes more
sense to just not emit the "terminal_output gfxterm" under certain
conditions. Does gfxterm have any effect on other UEFI-based systems?
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https://bugs.launchpad.net/bugs/1743884
Title:
installed GRUB menu does not appear on term used for install
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