Public bug reported:

I'm following the instructions given during the failing upgrade process:

...
Calculating the changes

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. 


Current release:
Description:    Ubuntu 14.04.5 LTS
Release:        14.04

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9
ProcVersionSignature: Ubuntu 3.13.0-105.152-generic 3.13.11-ckt39
Uname: Linux 3.13.0-105-generic i686
NonfreeKernelModules: openafs
ApportVersion: 2.14.1-0ubuntu3.23
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun Dec 18 19:27:59 2016
InstallationDate: Installed on 2010-03-20 (2465 days ago)
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-12-18 (0 days ago)
VarLogDistupgradeAptlog: Log time: 2016-12-18 19:28:05.458128

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


** Tags: apport-bug dist-upgrade i386 trusty

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https://bugs.launchpad.net/bugs/1650931

Title:
  Trying to upgrade from 14.04 LTS to 16.04 LTS

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