Cannot upgrade to Ubuntu Release 14.04.1 LTS

[Todd Lewis]

Using Update Manager, an attempt to perform the upgrade entitled, "New Ubuntu release '14.04.1 LTS' is available", fails with the error:
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.

Existing (pre-upgrade) version:
Description: Ubuntu 12.04.5 LTS
Release: 12.04

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.17
ProcVersionSignature: Ubuntu 3.2.0-68.102-generic-pae 3.2.62
Uname: Linux 3.2.0-68-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.7
Architecture: i386
Date: Wed Sep 3 15:45:34 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1409794669
 com.ubuntu.update-manager window-height 599
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2014-09-04 (0 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.