[Bug 1889030] Re: Upgrade process uninstalled other-repo-packages

[DarkTrick]

That does not meet the criteria for an explicit warning. 
The process showed about 150 "packages to be removed".

Voice of the general user:
- What is a package? (I install "apps" or "software")
- What is: idle-python3.7 libgcc1:i386 かきくけこ鬱食飲酒運転踵眉毛  ... ?
- You expect me to check 150 packages to make sure, that non of the 300 apps, that I installed over the years is not in that list? Isn't this the kind of work computers were made for?

Meaning: A user wouldn't find it in the salad of cryptic names.

But the real problem happens before that:
Why in the world would the system remove a software the user *manually* installed? 
I think the user wouldn't even think about checking that list, because he wouldn't imagine, that the system would do such a thing.


Defining "explicit":

==========================================
You installed the following applications. Unfortunately the system is not able to update or retain them. They have to be removed. If you need them please re-install them:

   Application     |    Reason
-------------------|---------------------
     qgis          | [reason why this package can neither be kept nor updated]
                   |

==========================================
Of course a perfect solution would be: Don't touch manual installations of the user (which I thought is the default behaviour, btw).

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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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