[Bug 1823259] Re: Update from grub-common AMD64 2.02-2ubuntu8.12 to 2.02-2ubuntu8.13 removed some Grub settings

[Mathieu Trudel-Lapierre]

Could you please run:

sudo debconf-show grub-pc
sudo debconf-show grub-efi-amd64


I've attempted to reproduce this; by first downgrading to a previous version, changing settings in /etc/default/grub, and proceeding with the upgrade, but no matter what I do, the changes do remain in /etc/default/grub.

I've tried simply setting i915.modeset=1, but also reverting again (so
i915.modeset=1 is present in debconf to begin with) and adding another
entry to be in GRUB_LINUX_CMDLINE_DEFAULT; and also the same with
GRUB_LINUX_CMDLINE.

As far as I call tell, the update works correctly, so we need to look if
there's anything special in the debconf database in case that would
affect the behavior.

Note for developers: the ucf code is only in grub-pc.postinst or grub-
efi-amd64.postinst; so this affects those packages rather than
grub(2?)-common.

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https://bugs.launchpad.net/bugs/1823259

Title:
  Update from grub-common AMD64 2.02-2ubuntu8.12 to 2.02-2ubuntu8.13
  removed some Grub settings

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  First, let me say that I don't have a lot of information, and will be
  happy if this is a "just me" thing.  But here's what happened.  Today
  around 8:30am on Ubuntu 18.04.2 HWE, I performed an apt update and apt
  upgrade.  Among the things that got upgraded was for grub-common,
  among a few others.  Upgrade proceeds without error and I continue to
  use my laptop.  A few hours pass and a shut down my laptop.  When I
  turn it back on, it boots, but the screen doesn't redraw properly.
  Full-screen windows don't properly show up, everything is real slow to
  render, mouse is slow to move.  I did a few things like try to switch
  to lightdm and reinstall xserver-xorg, but that didn't help.

  What *did* help was check on /etc/default/grub.  My laptop needs to
  have the Linux kernel parameter i915.modeset=1 in order for the
  display to work normally.  For some reason, this was absent after the
  update from this morning.  Considering grub-common updated, this is my
  suspect, however I don't know why it happened.

  I'd be welcome to include additional information, but I don't know
  what to provide.  And as I said, maybe it's just me.

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