[Bug 1903611] [NEW] it could not investigated which system-upgrades are available

[Reinhard]

Public bug reported:

first step :
starting tool ppa purge, having swept off all none official packages

second step
 starting upgrade routine for 20.04 lts upgrade

third step 
got notice  " it could not investigated which system upgrade are availiable 

update procedure stopped

well, give me a solution for this problem

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
Uname: Linux 4.15.0-122-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Nov 10 00:16:08 2020
InstallationDate: Installed on 2018-08-20 (812 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
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 2020-11-09 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1903611

Title:
  it could not investigated  which system-upgrades  are available

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

Bug description:
  first step :
  starting tool ppa purge, having swept off all none official packages

  second step
   starting upgrade routine for 20.04 lts upgrade

  third step 
  got notice  " it could not investigated which system upgrade are availiable 

  update procedure stopped

  well, give me a solution for this problem

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 4.15.0-122.124-generic 4.15.18
  Uname: Linux 4.15.0-122-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Nov 10 00:16:08 2020
  InstallationDate: Installed on 2018-08-20 (812 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  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 2020-11-09 (0 days ago)
  VarLogDistupgradeTermlog:

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