[Bug 1898009] [NEW] upgrader failes -Could not calculate the upgrade

[dvatsal]

Public bug reported:

An uresolvable problem occurred while calculating the upgrade

This was likely caused by:
*Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge from the ppa-purge
package to remove software from a LaunchpadPPA and try the upfrade again.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37 [origin: unknown]
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct  1 11:33:09 2020
InstallationDate: Installed on 2019-07-08 (450 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-01 (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/1898009

Title:
  upgrader failes -Could not calculate the upgrade

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

Bug description:
  An uresolvable problem occurred while calculating the upgrade

  This was likely caused by:
  *Unofficial software packages not provided by Ubuntu
  Please use the tool 'ppa-purge from the ppa-purge
  package to remove software from a LaunchpadPPA and try the upfrade again.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37 [origin: unknown]
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct  1 11:33:09 2020
  InstallationDate: Installed on 2019-07-08 (450 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-01 (0 days ago)
  VarLogDistupgradeTermlog:

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