[Bug 2100247] Re: Failure: The 3.0 solver produced a worse result

[Julian Andres Klode]

Suffice it to say, what happens on the real system is that it sees that
you have

postgresql-client-16

installed.

As that package is no longer available in the repository, it demotes it
in priority and when it sees a dependency on postgresql-client, installs
the metapackage. In this case, it seems to be the satisfied

Suggests: postgresql-client

in devscripts that is causing postgresql-client to be installed (as a
previously satisfied suggests is promoted to a Recommends).

This leaves multiple issues:

(1) The obsolete handling turns out to be crucial for upgrading
performance, as otherwise we failed the time_t upgrades, preferring to
keep installed libfoo1 around rather than switching to libfoo1t64.

(2) We can't easily fix this in the comparative approach, so each system
with obsolete packages that are in some or group or depended upon via
provides is going to trigger an evaluation report…

(3) It is entirely unclear why postgresql-client-16 is not obsolete when
using the dump

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https://bugs.launchpad.net/bugs/2100247

Title:
  Failure: The 3.0 solver produced a worse result

Status in apt package in Ubuntu:
  New

Bug description:
  this happens all the time when I run "apt dist-upgrade" and some
  packages are there to be installed.

  ProblemType: AptSolver
  DistroRelease: Ubuntu 25.04
  Package: apt 2.9.30ubuntu1
  ProcVersionSignature: Ubuntu 6.12.0-15.15-generic 6.12.11
  Uname: Linux 6.12.0-15-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.31.0+git20250220-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Wed Feb 26 07:18:31 2025
  ErrorMessage:
   
  InstallationDate: Installed on 2024-07-18 (223 days ago)
  InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
  SourcePackage: apt
  Title: Failure: The 3.0 solver produced a worse result
  UpgradeStatus: Upgraded to plucky on 2024-12-20 (68 days ago)

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