[Bug 1909401] [NEW] Impossible to upgrade from 18.04 to 20.04.1

[Dominique Breton]

Public bug reported:

Hi
I got a
"Impossible d'évaluer la mise à niveau

Un problème insoluble est survenu lors du calcul de la mise à niveau."
when trying to upgrade from 18.04  to 20.04.1.
Nothing to do since several months...
Thank you

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41 [origin: unknown]
ProcVersionSignature: Ubuntu 4.15.0-128.131-generic 4.15.18
Uname: Linux 4.15.0-128-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sun Dec 27 15:26:40 2020
InstallationDate: Installed on 2013-12-10 (2574 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-27 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1909401

Title:
  Impossible to upgrade from 18.04  to 20.04.1

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

Bug description:
  Hi
  I got a
  "Impossible d'évaluer la mise à niveau

  Un problème insoluble est survenu lors du calcul de la mise à niveau."
  when trying to upgrade from 18.04  to 20.04.1.
  Nothing to do since several months...
  Thank you

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41 [origin: unknown]
  ProcVersionSignature: Ubuntu 4.15.0-128.131-generic 4.15.18
  Uname: Linux 4.15.0-128-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sun Dec 27 15:26:40 2020
  InstallationDate: Installed on 2013-12-10 (2574 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-27 (0 days ago)
  VarLogDistupgradeTermlog:

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