[Bug 1901747] [NEW] Update from 18.04 to 20.04 not possible

[Hanky]

Public bug reported:

I removed all PPAs with ppa-purge, as well as (hopefully) all packages
created by myself.

1) Ubuntu release:
lsb_release -rd
Description:	Ubuntu 18.04.5 LTS
Release:	18.04

2)Package version
ubuntu-release-upgrader-core 1:18.04.40

3) Obviously I expected an upgrade to 20.04

4) Instead the upgrade process stopped with an error, telling me that the program was not able to determine which system upgrade was available, and that an unsolvable problem occurred - without further informations what the cause of the problem could be.   
It asks me to file this bug report.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 27 18:59:02 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 2020-10-27 (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/1901747

Title:
  Update from 18.04 to 20.04 not possible

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

Bug description:
  I removed all PPAs with ppa-purge, as well as (hopefully) all packages
  created by myself.

  1) Ubuntu release:
  lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  2)Package version
  ubuntu-release-upgrader-core 1:18.04.40

  3) Obviously I expected an upgrade to 20.04

  4) Instead the upgrade process stopped with an error, telling me that the program was not able to determine which system upgrade was available, and that an unsolvable problem occurred - without further informations what the cause of the problem could be.   
  It asks me to file this bug report.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 27 18:59:02 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 2020-10-27 (0 days ago)
  VarLogDistupgradeTermlog:

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