[Bug 1906100] [NEW] Ubuntu uptdate to version 20 does not work. Have to remove interfering installations but do not know , wiithout resetting the whole system.

[Peter Bernreuter]

Public bug reported:

Update for Ubuntu 20.04 'Focal Fossa' is aborted. It is said that it is
not possible to detect which  systemupdates are available. Says
probablly caused by unofficial software packages. Can this be fixed
automatically?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
ProcVersionSignature: Ubuntu 5.4.0-54.60~18.04.1-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Budgie:GNOME
Date: Sat Nov 28 10:03:32 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 2020-11-28 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1906100

Title:
  Ubuntu uptdate to version 20 does not work. Have to remove
  interfering installations but do not know , wiithout resetting the
  whole system.

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

Bug description:
  Update for Ubuntu 20.04 'Focal Fossa' is aborted. It is said that it
  is not possible to detect which  systemupdates are available. Says
  probablly caused by unofficial software packages. Can this be fixed
  automatically?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 5.4.0-54.60~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-54-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Budgie:GNOME
  Date: Sat Nov 28 10:03:32 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 2020-11-28 (0 days ago)
  VarLogDistupgradeTermlog:

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