[Bug 1923650] [NEW] unable to upgrade ubuntu from version 18.04 to 20.04

[Krishnamohan Nandakumar]

Public bug reported:

Today my ubuntu offered the possibility to upgrade to version 20.04 from
18.04, but when it tries to download the new software channels, it shows
an error message "Unable to calculate update"

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
Uname: Linux 4.15.0-141-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 13 23:23:33 2021
InstallationDate: Installed on 2021-04-13 (0 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-04-13 (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/1923650

Title:
  unable to upgrade ubuntu from version 18.04 to 20.04

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

Bug description:
  Today my ubuntu offered the possibility to upgrade to version 20.04
  from 18.04, but when it tries to download the new software channels,
  it shows an error message "Unable to calculate update"

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
  Uname: Linux 4.15.0-141-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Apr 13 23:23:33 2021
  InstallationDate: Installed on 2021-04-13 (0 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-13 (0 days ago)
  VarLogDistupgradeTermlog:

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