[Bug 1554328] [NEW] Couldn't calculate upgrade 12.04 LTS to 14 LTS

[Steve]

Public bug reported:

I disabled all "Other packages" in the package manager and still got the
error and am unable to upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.19
ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
Uname: Linux 3.2.0-39-generic i686
ApportVersion: 2.0.1-0ubuntu17.13
Architecture: i386
Date: Mon Mar  7 21:42:44 2016
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1457407962
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 604
 com.ubuntu.update-manager window-width 599
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 2016-03-08 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: apport-bug dist-upgrade i386 precise running-unity

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https://bugs.launchpad.net/bugs/1554328

Title:
  Couldn't calculate upgrade 12.04 LTS to 14 LTS

Status in update-manager package in Ubuntu:
  New

Bug description:
  I disabled all "Other packages" in the package manager and still got
  the error and am unable to upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.19
  ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
  Uname: Linux 3.2.0-39-generic i686
  ApportVersion: 2.0.1-0ubuntu17.13
  Architecture: i386
  Date: Mon Mar  7 21:42:44 2016
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1457407962
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 604
   com.ubuntu.update-manager window-width 599
  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 2016-03-08 (0 days ago)
  VarLogDistupgradeTermlog:

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