[Bug 1898378] [NEW] impossible to upgrade from 18.04 LTS to 20.04.1

[Dominique Breton]

Public bug reported:

Hi 
The update manager proposed me to upgrade my 18.04 LTS to the 20.04.1, but the process stops with  error  "Impossible d'évaluer la mise à niveau""Un problème insoluble est survenu lors du calcul de la mise à niveau"
Thank you

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sat Oct  3 18:45:17 2020
InstallationDate: Installed on 2013-12-10 (2489 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-03 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1898378

Title:
  impossible to upgrade from 18.04 LTS to 20.04.1

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

Bug description:
  Hi 
  The update manager proposed me to upgrade my 18.04 LTS to the 20.04.1, but the process stops with  error  "Impossible d'évaluer la mise à niveau""Un problème insoluble est survenu lors du calcul de la mise à niveau"
  Thank you

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sat Oct  3 18:45:17 2020
  InstallationDate: Installed on 2013-12-10 (2489 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-03 (0 days ago)
  VarLogDistupgradeTermlog:

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