[Bug 1898225] [NEW] system update from 18.04 to 20.04 fails, unresolvable error when setting up package sources

[Gernot]

Public bug reported:

output of lsb_release -rd:
Description:	Ubuntu 18.04.5 LTS
Release:	18.04

output of uname -r:
4.15.0-118-generic

system update from 18.04 to 20.04 fails, 
after reading new  package sources an unresolvable error occurs, package sources are rolled back to prior state,
custom ppas have been disabled manually before the system update, 
system stays on version 18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: LXDE
Date: Fri Oct  2 17:50:39 2020
InstallationDate: Installed on 2019-02-02 (607 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-02 (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/1898225

Title:
  system update from 18.04 to 20.04 fails, unresolvable error when
  setting up package sources

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

Bug description:
  output of lsb_release -rd:
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  output of uname -r:
  4.15.0-118-generic

  system update from 18.04 to 20.04 fails, 
  after reading new  package sources an unresolvable error occurs, package sources are rolled back to prior state,
  custom ppas have been disabled manually before the system update, 
  system stays on version 18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Fri Oct  2 17:50:39 2020
  InstallationDate: Installed on 2019-02-02 (607 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-02 (0 days ago)
  VarLogDistupgradeTermlog:

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