12-04 to 14-04 upgrade fails cannot calclate size

[Robert Cahn]

When I try and upgrade to 14-04 LTS it fails at the step when it tries to calculate the amount of disk space needed. It then restores the original configuration. Please suggest another upgrade path other than wiping the disk.

/Bob Cahn

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.17
ProcVersionSignature: Ubuntu 3.2.0-67.101-generic 3.2.60
Uname: Linux 3.2.0-67-generic i686
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Thu Aug 14 09:39:49 2014
EcryptfsInUse: Yes
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1408023011
 com.ubuntu.update-manager window-height 676
 com.ubuntu.update-manager window-width 600
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 2014-08-14 (0 days ago)
VarLogDistupgradeTermlog: