[Bug 1889030] [NEW] Upgrade process uninstalled other-repo-packages

[DarkTrick]

Public bug reported:

I had qgis installed from it's original repo (https://qgis.org/ubuntu,
https://qgis.org/ubuntu-ltr).

During the upgrade process from 19.10 to 20.04 the package got
uninstalled.

Expected
(1) User installed software should not get automatically uninstalled
(2) IF it is absolutely necessary to uninstall user-installed software, the user should get an EXPLICIT warning stating that the software is going to be removed. The explicit warning should be shown BEFORE doing the upgrade, so the user can decide if the upgrade is worth it.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.23
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Mon Jul 27 13:15:39 2020
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to focal on 2020-07-24 (2 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal

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https://bugs.launchpad.net/bugs/1889030

Title:
  Upgrade process uninstalled other-repo-packages

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

Bug description:
  I had qgis installed from it's original repo (https://qgis.org/ubuntu,
  https://qgis.org/ubuntu-ltr).

  During the upgrade process from 19.10 to 20.04 the package got
  uninstalled.

  Expected
  (1) User installed software should not get automatically uninstalled
  (2) IF it is absolutely necessary to uninstall user-installed software, the user should get an EXPLICIT warning stating that the software is going to be removed. The explicit warning should be shown BEFORE doing the upgrade, so the user can decide if the upgrade is worth it.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.23
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Mon Jul 27 13:15:39 2020
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to focal on 2020-07-24 (2 days ago)
  VarLogDistupgradeTermlog:

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