[Bug 2033308] Re: conffile prompt in upgrade from 29 -> 29.2

[John Chittum]

I worked up a reproducer of things operating as expected, which makes me
believe it's a timing issue around when `livecd-rootfs` and `live-build`
do cleanup.  on livecd-rootfs:ubuntu/master, i added the following to
`live-build/ubuntu-cpc/hooks.d/base/create-root-dir.binary`

env DEBIAN_FRONTEND=noninteractive chroot $rootfs_dir apt-get --purge remove --assume-yes ubuntu-advantage-tools
env DEBIAN_FRONTEND=noninteractive chroot $rootfs_dir apt-get autoremove --purge --assume-yes
env DEBIAN_FRONTEND=noninteractive chroot $rootfs_dir apt-get install --assume-yes ubuntu-advantage-tools

I then ran a build of `PROJECT=ubuntu-cpc IMAGE_TARGET=tarball`

afterwards, registered an lxc container locally with the lxd metadata
from cloud-images.ubuntu.com (http://cloud-
images.ubuntu.com/mantic/20230823/mantic-server-cloudimg-
amd64-lxd.tar.xz)

lxc image import mantic-server-cloudimg-amd64-lxd.tar.xz livecd.ubuntu-
cpc.rootfs.tar.xz --alias mantic-ua-manual-install

lxc shell immortal-bobcat 
root at immortal-bobcat:~# dpkg -l | grep ubuntu-ad
ii  ubuntu-advantage-tools          29.3                                    amd64        management tools for Ubuntu Pro
root at immortal-bobcat:~# ls /etc/apt/preferences.d/
ubuntu-pro-esm-apps  ubuntu-pro-esm-infra
root at immortal-bobcat:~# cat /etc/cloud/build.info 
build_name: server
serial: 20230901.1405

I'm now going to see if i can work up a reproducer of it _failing_ on
Jammy by adding a proposed install during `auto/build` rather than a
hook.

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https://bugs.launchpad.net/bugs/2033308

Title:
  conffile prompt in upgrade from 29 -> 29.2

Status in livecd-rootfs package in Ubuntu:
  New
Status in ubuntu-advantage-tools package in Ubuntu:
  New

Bug description:
  When updating ubuntu-advantage-tools from 29 -> 29.2, a conffile prompt is seen.
  This is on a system that is presumed to not have modified the relevant files.

  
  Setting up ubuntu-advantage-tools (29.2) ...

  Configuration file '/etc/apt/preferences.d/ubuntu-pro-esm-apps'
   ==> Deleted (by you or by a script) since installation.
   ==> Package distributor has shipped an updated version.
     What would you like to do about it ?  Your options are:
      Y or I  : install the package maintainer's version
      N or O  : keep your currently-installed version
        D     : show the differences between the versions
        Z     : start a shell to examine the situation
   The default action is to keep your current version.
  *** ubuntu-pro-esm-apps (Y/I/N/O/D/Z) [default=N] ?

  Configuration file '/etc/apt/preferences.d/ubuntu-pro-esm-infra'
   ==> Deleted (by you or by a script) since installation.
   ==> Package distributor has shipped an updated version.
     What would you like to do about it ?  Your options are:
      Y or I  : install the package maintainer's version
      N or O  : keep your currently-installed version
        D     : show the differences between the versions
        Z     : start a shell to examine the situation
   The default action is to keep your current version.
  *** ubuntu-pro-esm-infra (Y/I/N/O/D/Z) [default=N] ?

  steps to reproduce (at least today):
  lxc launch ubuntu-daily:mantic
  in container:
   apt update
   apt install ubuntu-advantage-tools

  Discovered in subiquity CI -
  https://github.com/canonical/subiquity/actions/runs/6003040269/job/16280611441?pr=1773#step:3:1080

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