[Bug 1743884] Re: installed GRUB menu does not appear on term used for install

[dann frazier]

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

Status in grub2 package in Ubuntu:
  New

Bug description:
  [Impact]
  I have a UEFI-based server with both a graphical head and a serial console (Cavium Sabre). If I boot the netboot (d-i) installer, the install menu appears on both, and I'm able to interact with the installer over both the serial console and the graphical head. However, when booting into the *installed* system (w/ HIDDEN_TIMEOUT disabled), the GRUB menu only appears over the graphical head. I can use either serial or graphical for input - that is, if I monitor the graphical head I can see the changes I'm typing on the serial console, but the serial console remains blank until I boot into Linux.

  Note: MAAS installations are not impacted by this because curtin adds
  an /etc/default/grub.d stub that manually sets
  "GRUB_TERMINAL=console".

  [Test Case]
  Install the system using d-i over the serial console.
  Comment out the HIDDEN variables in /etc/default/grub.
  sudo update-grub
  Reboot - and watch for the GRUB menu over the serial console.

  [Regression Risk]
  TBD

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