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

[Brian Murray]

It seems that you are running Ubuntu 18.04 on your system but your
/etc/apt/sources.list file only has entries for Ubuntu 16.04 (xenial).
You'll need to replace xenial with bionic in your sources.list file,
ensure your system is up to date, and then try the release upgrade
again.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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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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