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

[Anon spider]

Public bug reported:

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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

** Attachment added: "main.log"
   https://bugs.launchpad.net/bugs/1929155/+attachment/5499156/+files/main.log

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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:
  New

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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