[Bug 1697411] [NEW] Could not calculate the upgrade

[Emil]

Public bug reported:

hi,
it shows (box) when trying to update my 14.04 to 16.
Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

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

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9
ProcVersionSignature: Ubuntu 3.13.0-119.166-generic 3.13.11-ckt39
Uname: Linux 3.13.0-119-generic i686
ApportVersion: 2.14.1-0ubuntu3.24
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Jun 12 15:27:55 2017
InstallationDate: Installed on 2016-03-16 (452 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2017-06-12 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: apport-bug dist-upgrade i386 third-party-packages trusty

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https://bugs.launchpad.net/bugs/1697411

Title:
  Could not calculate the upgrade

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

Bug description:
  hi,
  it shows (box) when trying to update my 14.04 to 16.
  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This can be caused by:
   * Upgrading to a pre-release version of Ubuntu
   * Running the current pre-release version of Ubuntu
   * Unofficial software packages not provided by Ubuntu

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

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.9
  ProcVersionSignature: Ubuntu 3.13.0-119.166-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-119-generic i686
  ApportVersion: 2.14.1-0ubuntu3.24
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Jun 12 15:27:55 2017
  InstallationDate: Installed on 2016-03-16 (452 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2017-06-12 (0 days ago)
  VarLogDistupgradeTermlog:

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