[Bug 1968874] [NEW] Upgrades from Focal to Jammy pull in Postfix

[Robie Basak]

Public bug reported:

Steps to reproduce:

lxc launch ubuntu:focal reproducer
lxc exec reproducer bash
do-release-upgrade -d

Expected: no Postfix debconf prompt
Actual: Postfix debconf prompt

This is bad because there's a debconf prompt at all, but also that users
don't really know how to respond to this one because they're not the
ones demanding an MTA.

Why is Postfix being pulled in on this upgrade? After the upgrade, I see
that the only thing that Recommends default-mta | mail-transport-agent
is popularity-contest, so I think this package is the culprit.

In Focal, was seeded in the standard seed which is why it was installed.
However, the version in Focal does not have this Recommends.

In Jammy, it is no longer seeded (https://git.launchpad.net/~ubuntu-
core-dev/ubuntu-
seeds/+git/platform/commit/standard?id=82c97be2eee777cb2f579474259cf86e51fe3a8f)
but since it was installed previously, the upgrade causes Postfix to get
installed during the upgrade process.

A possible solution is to remove the Recommends in an Ubuntu delta.

** Affects: popularity-contest (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: rls-jj-incoming

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https://bugs.launchpad.net/bugs/1968874

Title:
  Upgrades from Focal to Jammy pull in Postfix

Status in popularity-contest package in Ubuntu:
  New

Bug description:
  Steps to reproduce:

  lxc launch ubuntu:focal reproducer
  lxc exec reproducer bash
  do-release-upgrade -d

  Expected: no Postfix debconf prompt
  Actual: Postfix debconf prompt

  This is bad because there's a debconf prompt at all, but also that
  users don't really know how to respond to this one because they're not
  the ones demanding an MTA.

  Why is Postfix being pulled in on this upgrade? After the upgrade, I
  see that the only thing that Recommends default-mta | mail-transport-
  agent is popularity-contest, so I think this package is the culprit.

  In Focal, was seeded in the standard seed which is why it was
  installed. However, the version in Focal does not have this
  Recommends.

  In Jammy, it is no longer seeded (https://git.launchpad.net/~ubuntu-
  core-dev/ubuntu-
  seeds/+git/platform/commit/standard?id=82c97be2eee777cb2f579474259cf86e51fe3a8f)
  but since it was installed previously, the upgrade causes Postfix to
  get installed during the upgrade process.

  A possible solution is to remove the Recommends in an Ubuntu delta.

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