[Bug 1718834] [NEW] cannot upgrade to 16.04

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Public bug reported:

I have this message "Could not calculate the upgrade"

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-132.181-generic 3.13.11-ckt39
Uname: Linux 3.13.0-132-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.25
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Fri Sep 22 11:54:22 2017
InstallationDate: Installed on 2014-10-20 (1067 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2017-09-22 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1718834

Title:
  cannot upgrade to 16.04

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

Bug description:
  I have this message "Could not calculate the upgrade"

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-132.181-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-132-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.25
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Fri Sep 22 11:54:22 2017
  InstallationDate: Installed on 2014-10-20 (1067 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2017-09-22 (0 days ago)
  VarLogDistupgradeTermlog:

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