[Bug 1810450] [NEW] LTS dist upgrade failure from 16.04 to 18.04

[Thibaut]

Public bug reported:

I just upgrade from 14.04 to 16.04 before. I had some broken packages
that I corrected.

Then:
sudo apt-get update
sudo apt-get upgrade
sudo do-release-upgrade

leads me to:
-> Un problème insoluble est survenu lors de la préparation de la mise à 
niveau. 
-> ENGLISH: An unresolvable problem occurred while calculating the upgrade

In /var/log/dist-upgrade/XXX/main.log :

-> ERROR Dist-upgrade failed: 'E:Erreur, pkgProblem::Resolve a généré des ruptures
-> ENGLISH: pkgProblemResolver::Resolve generated breaks, this may be caused by held packages

Thanks for any help

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Jan  4 00:01:45 2019
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-01-03 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2019-01-02T16:24:36.364160

** 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/1810450

Title:
  LTS dist upgrade failure from 16.04 to 18.04

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

Bug description:
  I just upgrade from 14.04 to 16.04 before. I had some broken packages
  that I corrected.

  Then:
  sudo apt-get update
  sudo apt-get upgrade
  sudo do-release-upgrade

  leads me to:
  -> Un problème insoluble est survenu lors de la préparation de la mise à 
  niveau. 
  -> ENGLISH: An unresolvable problem occurred while calculating the upgrade

  In /var/log/dist-upgrade/XXX/main.log :

  -> ERROR Dist-upgrade failed: 'E:Erreur, pkgProblem::Resolve a généré des ruptures
  -> ENGLISH: pkgProblemResolver::Resolve generated breaks, this may be caused by held packages

  Thanks for any help

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
  Uname: Linux 4.4.0-141-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Jan  4 00:01:45 2019
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-01-03 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2019-01-02T16:24:36.364160

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