[Bug 1511918] [NEW] impossible to evaluate the upgrade

[Serge croq]

Public bug reported:

An insoluble problem occurred during the preparation of the upgrade.

  This may be due to:
  * Upgrade to a development version of Ubuntu;
  * The development version of Ubuntu is being used;
  * Unofficial software packages not provided by Ubuntu.

If none of this applies, please report this bug using the command
'ubuntu-bug ubuntu-release-upgrade-core' in a terminal.

Hi,
It's a google translation.
thank you in advance for your work and your answers.
Serge

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.3
ProcVersionSignature: Ubuntu 3.19.0-32.37-generic 3.19.8-ckt7
Uname: Linux 3.19.0-32-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.7
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Sat Oct 31 08:10:35 2015
InstallationDate: Installed on 2015-08-16 (75 days ago)
InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to vivid on 2015-10-31 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1511918

Title:
  impossible to evaluate the upgrade

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

Bug description:
  An insoluble problem occurred during the preparation of the upgrade.

    This may be due to:
    * Upgrade to a development version of Ubuntu;
    * The development version of Ubuntu is being used;
    * Unofficial software packages not provided by Ubuntu.

  If none of this applies, please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrade-core' in a terminal.

  Hi,
  It's a google translation.
  thank you in advance for your work and your answers.
  Serge

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.3
  ProcVersionSignature: Ubuntu 3.19.0-32.37-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-32-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Sat Oct 31 08:10:35 2015
  InstallationDate: Installed on 2015-08-16 (75 days ago)
  InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-31 (0 days ago)
  VarLogDistupgradeTermlog:

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