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

[dvatsal]

Received error message as shown in the attachment and same was there
originally before changing sources.list file and trying to upgrade.And
also note that I use the command to perform upgrade:-

sudo do-release-upgrade -d -f DistUpgradeViewGtk3

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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:
  Incomplete

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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