Public bug reported:
Impossible d'évaluer la mise à niveau
An unresolvable problem occurred while calculating the upgrade.
Si rien de tout cela ne s'applique, veuillez signaler ce bogue en
utilisant la commande « ubuntu-bug ubuntu-release-upgrader-core »
dans un terminal.If you want to investigate this yourself the log
files in '/var/log/dist-upgrade' will contain details about the
upgrade. Specifically, look at 'main.log' and 'apt.log'.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.32
ProcVersionSignature: Ubuntu 4.4.0-208.240-generic 4.4.262
Uname: Linux 4.4.0-208-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.30
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Apr 14 11:37:29 2021
InstallationDate: Installed on 2014-03-02 (2599 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary
20120425-15:28
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2021-04-14 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial
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https://bugs.launchpad.net/bugs/1923818
Title:
can't upgrade from 16.04LTS to 18.04LTS
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