[Bug 1905120] Re: impossible d'evaluer la mise a niveau

[Brian Murray]

The upgrade was not able to calculate because you are using a non-
official mirror of the Ubuntu archive which was then disabled. Please
switch to an official mirror of the Ubuntu archive and try the upgrade
again.

2020-11-21 10:19:04,788 DEBUG examining: 'deb http://ftp.belnet.be/ubuntu.com/ubuntu/ bionic main restricted'
2020-11-21 10:19:04,791 DEBUG entry '# deb http://ftp.belnet.be/ubuntu.com/ubuntu/ focal main restricted # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror) 
2020-11-21 10:19:04,792 DEBUG examining: 'deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial main restricted'
2020-11-21 10:19:04,792 DEBUG examining: 'deb http://ftp.belnet.be/ubuntu.com/ubuntu/ bionic-updates main restricted'
2020-11-21 10:19:04,795 DEBUG entry '# deb http://ftp.belnet.be/ubuntu.com/ubuntu/ bionic-updates main restricted # désactivé pour la mise à niveau vers focal' was disabled (unknown mirror)

You can find a list of official mirrors here:

https://launchpad.net/ubuntu/+archivemirrors

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https://bugs.launchpad.net/bugs/1905120

Title:
  impossible d'evaluer la mise a niveau

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

Bug description:
  Migration 18LTE > 20 
  Un problème insoluble est survenu lors du calcul de la mise à niveau.
   Si rien de tout cela ne s'applique, signalez ce bogue à l'aide de la commande « ubuntu-bug ubuntu-release-upgrader-core » dans un terminal. Si vous souhaitez analyser le problème par vous-même, les fichiers journaux contenus dans le répertoire « /var/log/dist-upgrade » contiennent les informations sur la mise à niveau. Plus précisément, veuillez consulter les journaux « main.log » et « apt.log ».

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
  Uname: Linux 4.15.0-124-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sat Nov 21 10:19:50 2020
  InstallationDate: Installed on 2016-10-20 (1492 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-11-21 (0 days ago)
  VarLogDistupgradeTermlog:

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