[Bug 1899707] Re: Upgrade from 18.04.5LTS to 20.04LTS fails from terminal and upgrade tool with error "Could not calculate the upgrade An unresolvable 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 Launchpad PPA and try the upgrade again." No package to be removed is mentioned

[Ian]

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'.

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https://bugs.launchpad.net/bugs/1899707

Title:
  Upgrade from 18.04.5LTS  to 20.04LTS fails from terminal and upgrade
  tool with error "Could not calculate the upgrade  An unresolvable
  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 Launchpad PPA and  try the upgrade again." No package
  to be removed is mentioned

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

Bug description:
  W: Skipping acquire of configured file 'contrib/binary-amd64/Packages' as repository 'http://ftp.iinet.net.au/pub/ubuntu bionic InRelease' doesn't have the component 'contrib' (component misspelt in sources.list?)
  W: Skipping acquire of configured file 'contrib/binary-i386/Packages' as repository 'http://ftp.iinet.net.au/pub/ubuntu bionic InRelease' doesn't have the component 'contrib' (component misspelt in sources.list?)
  W: Skipping acquire of configured file 'contrib/i18n/Translation-en' as repository 'http://ftp.iinet.net.au/pub/ubuntu bionic InRelease' doesn't have the component 'contrib' (component misspelt in sources.list?)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Oct 14 10:14:36 2020
  InstallationDate: Installed on 2017-02-02 (1349 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-13 (0 days ago)
  VarLogDistupgradeTermlog:

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