[Bug 1434098] [NEW] cannot upgrade to 14.04

[Sol Schvartzman]

Public bug reported:

I am trying to upgrade from version 12.04 LTS to 14.04.2 LTS. It does
the Preparing to Upgrade step but it stops at the next one: Setting new
channel software and it returns the 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

If none of this applies, then please report this bug using the command
'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.18
ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66
Uname: Linux 3.2.0-77-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
Date: Thu Mar 19 14:48:24 2015
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1426772841
 com.ubuntu.update-manager window-height 532
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2015-03-19 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade precise

** Summary changed:

- cannot upgrade
+ cannot upgrade to 14.04

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https://bugs.launchpad.net/bugs/1434098

Title:
  cannot upgrade to 14.04

Status in update-manager package in Ubuntu:
  New

Bug description:
  I am trying to upgrade from version 12.04 LTS to 14.04.2 LTS. It does
  the Preparing to Upgrade step but it stops at the next one: Setting
  new channel software and it returns the 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

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.18
  ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66
  Uname: Linux 3.2.0-77-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Date: Thu Mar 19 14:48:24 2015
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1426772841
   com.ubuntu.update-manager window-height 532
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2015-03-19 (0 days ago)
  VarLogDistupgradeTermlog:

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