could not calculate upgrade from 12.04 to 14.04

[Matt]

Kubuntu 12.04 LTS
muon-updater 1.3.1-0ubuntu2
I expected that the upgrade would work, but got this error instead

file:///var/log/dist-upgrade/20140523-0840/apt.log
file:///var/log/dist-upgrade/20140523-0840/main.log
file:///var/log/dist-upgrade/20140523-0840/term.log
file:///var/log/dist-upgrade/20140523-0840/apt.log
file:///var/log/dist-upgrade/20140523-0840/main.log
file:///var/log/dist-upgrade/20140523-0840/term.log
file:///var/log/dist-upgrade/20140523-0840/apt.log
file:///var/log/dist-upgrade/20140523-0840/main.log
file:///var/log/dist-upgrade/20140523-0840/term.log
file:///var/log/dist-upgrade/apt.log
file:///var/log/dist-upgrade/main.log
file:///var/log/dist-upgrade/term.log
file:///var/log/dist-upgrade/apt.log
file:///var/log/dist-upgrade/main.log
file:///var/log/dist-upgrade/term.log
file:///var/log/dist-upgrade/apt.log
file:///var/log/dist-upgrade/main.log
file:///var/log/dist-upgrade/term.log

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.13
ProcVersionSignature: Ubuntu 3.2.0-61.93-generic 3.2.55
Uname: Linux 3.2.0-61-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Fri May 23 08:47:55 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1400857397
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 660
 com.ubuntu.update-manager window-width 600
InstallationMedia: Kubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 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 2014-05-23 (0 days ago)
VarLogDistupgradeTermlog:

[Matt (davidsheart1)]

dist-upgrade