[Bug 2078745] Re: Unable to upgrade to 24.04 due to error: "The package 'postgresql-14-postgis-3' is marked for removal but it is in the removal deny list."

[gavin johnson]

In my case, the installer allowed me to remove postgres-14 and complete
the upgrade. Then once running on 24.04 I wondered where my database had
gone. I found the new database postgres-16 on port 5433 but my data was
on the old cluster without a recent backup. The process is clear to me
now, but it wasn't clear enough during the installation to avoid the
bear trap.

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https://bugs.launchpad.net/bugs/2078745

Title:
  Unable to upgrade to 24.04 due to error: "The package
  'postgresql-14-postgis-3' is marked for removal but it is in the
  removal deny list."

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  I received a notification that Ubuntu 24.04.1 was finally available
  and I could now upgrade to it. I started the upgrade process but it
  stopped due to the aforementioned error stating: "The package
  'postgresql-14-postgis-3' is marked for removal but it is in the
  removal deny list."

  The error message also suggested that I report the issue using the
  "ubuntu-bug ubuntu-release-upgrader-core" command, so here we are.

  I do have Postgres and PostGIS installed locally, with lots of useful
  data in it. How can I upgrade smoothly without data loss? Or do I have
  to back it up, uninstall Postgres and restore from the backup?

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.19
  ProcVersionSignature: Ubuntu 6.8.0-40.40~22.04.3-generic 6.8.12
  Uname: Linux 6.8.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.6
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Sep  2 23:05:04 2024
  InstallationDate: Installed on 2024-04-20 (135 days ago)
  InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to jammy on 2024-09-02 (0 days ago)
  VarLogDistupgradeAptHistorylog:
   Start-Date: 2024-09-02  22:54:20
   Requested-By: yewo (1000)
   End-Date: 2024-09-02  22:54:20
  VarLogDistupgradeApttermlog:
   Log started: 2024-09-02  22:54:20
   Log ended: 2024-09-02  22:54:20
  VarLogDistupgradeTermlog:

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