[Bug 1615312] [NEW] Can not upgrade from 14.04 to 16.04

[scippane]

Public bug reported:

After running the command

sudo do-release-upgrade

I get the following error message

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

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
Uname: Linux 3.13.0-93-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Aug 20 18:30:22 2016
InstallationDate: Installed on 2012-10-31 (1389 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-08-21 (0 days ago)

** 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/1615312

Title:
  Can not upgrade from 14.04 to 16.04

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

Bug description:
  After running the command

  sudo do-release-upgrade

  I get the following error message

  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

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-93-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sat Aug 20 18:30:22 2016
  InstallationDate: Installed on 2012-10-31 (1389 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-21 (0 days ago)

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