[Bug 1900333] Re: release-update tp 20.04 LTS failed

[U. Partheil]

2021-08-23:
>From time to time I checked upgrade-possibilities: always the same.
But last week the upgrade-process went further on -- until to a point, where it says something like: "upgrade only partially possible; continue? or continue?"
After that it was no longer possible to boot, I didn't even manage to reach grub
==> I gave up
and installed 20.04 from scratch.

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https://bugs.launchpad.net/bugs/1900333

Title:
  release-update tp 20.04 LTS failed

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

Bug description:
  1)
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  3) upgrade to 20.04 LTS
  4) 
  Es konnte nicht ermittelt werden, welche Systemaktualisierungen verfügbar sind

  Ein unlösbares Problem trat während der Berechnung der
  Systemaktualisierung auf.

   Wenn keine dieser zutrifft, melden Sie bitte den Fehler mithilfe des
  Befehls 'ubuntu-bug ubuntu-release-upgrader-core' in einem Terminal.
  Wenn Sie dies selbst untersuchen möchten, finden Sie in den
  Protokolldateien unter »/var/log/dist-upgrade« Details zur
  Systemaktualisierung. Schauen Sie sich insbesondere »main.log« und
  »apt.log« an.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
  Uname: Linux 4.15.0-121-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Oct 18 15:53:24 2020
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-18 (0 days ago)
  VarLogDistupgradeTermlog:

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