[Bug 1929155] Re: i cant upgrade from 18.04 to 20.04.02 "Cannot calculate the upgrade"

[Chris Guiver]

Thank you for taking the time to report this issue and helping to make
Ubuntu better.

The error message you obtained says

"* 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."

If you check your sources, you have 3rd party packages installed, a 3rd
party MATE PPA & https://deb.nodesource.com/node_14.x which provides the
package that is at least one of your issues (ie. nodejs
14.17.0-1nodesource1

I would recommend following the advice in the error message provided in
your bug description.

I've marked this incomplete, as you haven't followed the instructions of
the error message; or remove all 3rd party software before allowing
upgrade to proceed.

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

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https://bugs.launchpad.net/bugs/1929155

Title:
  i cant upgrade from 18.04 to 20.04.02 "Cannot calculate the upgrade"

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

Bug description:
  sudo do-release-upgrade -d

  Fetched 44.5 MB in 5s (1,655 kB/s)

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  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.

  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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  Uname: Linux 5.4.15-050415-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri May 21 00:36:42 2021
  InstallationDate: Installed on 2018-05-17 (1099 days ago)
  InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=pt_BR:pt:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-21 (0 days ago)

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