[Bug 1883352] Re: impossible to migrate from 18.04 to 20.04

[Christophe Brajon]

This is still not working even after removing all ppa except the
official Ubuntu ones and two that I cannot remove for unknown reasons.

decebal at decebal-PORTEGE-Z30-B:~$ grep -Rn --include=\*.list ^[^\#] /etc/apt/
/etc/apt/sources.list:5:deb http://fr.archive.ubuntu.com/ubuntu/ bionic main restricted
/etc/apt/sources.list:10:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
/etc/apt/sources.list:16:deb http://fr.archive.ubuntu.com/ubuntu/ bionic universe
/etc/apt/sources.list:18:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates universe
/etc/apt/sources.list:26:deb http://fr.archive.ubuntu.com/ubuntu/ bionic multiverse
/etc/apt/sources.list:28:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
/etc/apt/sources.list:36:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
/etc/apt/sources.list:43:deb http://archive.canonical.com/ubuntu bionic partner
/etc/apt/sources.list:46:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-security main restricted
/etc/apt/sources.list:48:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-security universe
/etc/apt/sources.list:50:deb http://fr.archive.ubuntu.com/ubuntu/ bionic-security multiverse
/etc/apt/sources.list.d/playonlinux.list:1:deb http://deb.playonlinux.com/ bionic main
/etc/apt/sources.list.d/skype-stable.list:1:deb [arch=amd64] https://repo.skype.com/deb stable main

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https://bugs.launchpad.net/bugs/1883352

Title:
  impossible to migrate from 18.04 to 20.04

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

Bug description:
  When trying to upgrade from 18.04 to 20.04, I get the following error
  "Impossible d'évaluer la mise à niveau

  Un problème insoluble est survenu lors du calcul de la mise à niveau.

  Cela a probablement été causé par : 
  * des paquets logiciels non officiels qui ne proviennent pas 
  d’Ubuntu. 
  Veuillez utiliser la commande « ppa-purge » du paquet 
  « ppa-purge » afin de supprimer les paquets d’un 
  dépôt PPA Launchpad, puis essayez de relancer la mise à niveau. 
  "
  I tried the ppa purge but it does not solve the problem. I have tried with sudo do-release-upgrade -d --allow-third-party and sudo do-release-upgrade -d but it gives the same result

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 4.15.0-106.107-generic 4.15.18
  Uname: Linux 4.15.0-106-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: communitheme:ubuntu:GNOME
  Date: Sat Jun 13 11:57:53 2020
  InstallationDate: Installed on 2019-01-21 (509 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-06-13 (0 days ago)

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