[Bug 2033308] Re: live-build manipulation of conffiles results in them being treated as modified by end user

[Catherine Redfield]

debdiff for xenial

** Patch added: "lp-2033308-backup-and-restore-packaged-preferences-xenial.debdiff"
   https://bugs.launchpad.net/ubuntu/bionic/+source/live-build/+bug/2033308/+attachment/5711366/+files/lp-2033308-backup-and-restore-packaged-preferences-xenial.debdiff

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

Title:
  live-build manipulation of conffiles results in them being treated as
  modified by end user

Status in live-build package in Ubuntu:
  Fix Released
Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in ubuntu-advantage-tools package in Ubuntu:
  Invalid
Status in live-build source package in Xenial:
  Fix Committed
Status in livecd-rootfs source package in Xenial:
  Invalid
Status in ubuntu-advantage-tools source package in Xenial:
  Invalid
Status in live-build source package in Bionic:
  Fix Committed
Status in livecd-rootfs source package in Bionic:
  Invalid
Status in ubuntu-advantage-tools source package in Bionic:
  Invalid
Status in live-build source package in Focal:
  Fix Committed
Status in livecd-rootfs source package in Focal:
  Invalid
Status in ubuntu-advantage-tools source package in Focal:
  Invalid
Status in live-build source package in Jammy:
  Fix Committed
Status in livecd-rootfs source package in Jammy:
  Invalid
Status in ubuntu-advantage-tools source package in Jammy:
  Invalid
Status in live-build source package in Lunar:
  Fix Committed
Status in livecd-rootfs source package in Lunar:
  Invalid
Status in ubuntu-advantage-tools source package in Lunar:
  Invalid

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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