[Bug 1309877] [NEW] Upgrade to 14.04 fails

[Huahan]

Public bug reported:

Upgrading from 13.10 to 14.04, fails early at 'Setting new channels',
gives the below message:

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

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.5
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
CrashDB: ubuntu
Date: Sat Apr 19 17:52:34 2014
InstallationDate: Installed on 2012-10-20 (545 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to saucy on 2014-04-19 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade saucy third-party-packages

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https://bugs.launchpad.net/bugs/1309877

Title:
  Upgrade to 14.04 fails

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

Bug description:
  Upgrading from 13.10 to 14.04, fails early at 'Setting new channels',
  gives the below message:

  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

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: ubuntu-release-upgrader-core 1:0.205.5
  ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
  Uname: Linux 3.11.0-19-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Apr 19 17:52:34 2014
  InstallationDate: Installed on 2012-10-20 (545 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to saucy on 2014-04-19 (0 days ago)
  VarLogDistupgradeTermlog:

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