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

[Dan Bungert]

** Summary changed:

- conffile prompt in upgrade from 29 -> 29.2
+ live-build manipulation of conffiles results in them being treated as modified by end user

** Changed in: ubuntu-advantage-tools (Ubuntu)
       Status: New => Invalid

** Also affects: live-build (Ubuntu)
   Importance: Undecided
       Status: New

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