[Bug 1883352] [NEW] impossible to migrate from 18.04 to 20.04

[drouineau]

Public bug reported:

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)

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


** Tags: amd64 apport-bug bionic dist-upgrade

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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:
  New

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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