[Bug 1009294] Re: Grub update breaks automated dist-upgrade scripts on AMI images

[Steve Langasek]

The analysis here is incorrect.  The previous SRU affected the
generation of /boot/grub/grub.cfg, but it did *not* touch
/etc/default/grub, which is what the ucf prompt on upgrade is about.
Reverting the SRU not only won't fix the issue, it most likely will
cause the same issue *again* for affected users on upgrade.

I'm looking now to try to figure out why ucf is prompting here.  It
*shouldn't*, because there are no changes to the ucf template between
the old and new versions of the package; so the fact that there is a
prompt points to a bug in the ucf invocation, a bug in ucf, or a bug in
the AMI having messed with ucf's internals inappropriately.

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https://bugs.launchpad.net/bugs/1009294

Title:
  Grub update breaks automated dist-upgrade scripts on AMI images

Status in “grub2” package in Ubuntu:
  In Progress
Status in “grub2” source package in Precise:
  In Progress

Bug description:
  The update committed here:
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/978464  appears
  to have exposed a bug in either grub or apt that is breaking scripts
  based on the Amazon images from cloud.ubuntu.com.

  See http://askubuntu.com/questions/146921/how-do-i-apt-get-y-dist-
  upgrade-without-a-grub-config-prompt

  
  Specifically, dpkg is giving the upgraded config file prompt upon configuring grub-pc ("A new version of configuration file /etc/default/grub is available, but the version installed currently has been locally modified.")

  However, the following does not work:
  sudo apt-get update
  sudo apt-get -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" dist-upgrade

  Furthermore, dpkg -S /etc/default/grub  doesn't appear to show this
  file as being owned by any package prior to upgrade.  I'm not sure how
  this file is generated (or how dpkg determines who owns it), but it's
  currently breaking scripts and I can't figure out a way to work around
  it short of deleting the file prior to the upgrade (which probably
  isn't safe).

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