[Bug 1900431] [NEW] no possibility to upgrade from 18.04 to 20.04. the reason ppa repositories. already disaplbed and removed

[Jan Debiec]

Public bug reported:

after disabling and removing ppa from repository, still
can not upgrade,
getting error message:

Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
Uname: Linux 4.15.0-121-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 19 11:19:16 2020
InstallationDate: Installed on 2017-04-09 (1288 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-19 (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/1900431

Title:
  no possibility to upgrade from 18.04 to 20.04. the reason ppa
  repositories. already disaplbed and removed

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

Bug description:
  after disabling and removing ppa from repository, still
  can not upgrade,
  getting error message:

  Could not calculate the upgrade
  An unresolvable problem occurred while calculating the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
  Uname: Linux 4.15.0-121-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Oct 19 11:19:16 2020
  InstallationDate: Installed on 2017-04-09 (1288 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-19 (0 days ago)
  VarLogDistupgradeTermlog:

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