[Bug 1360848] [NEW] upgrade crashes with "Could not calculate the upgrade"

[ryan rose]

Public bug reported:

"Could not calculate upgrade" error aborts the software upgrade from
Ubuntu 12.04.5 LTS to 14.04 LTS

The upgrade was proceeding through step 2 "Setting new software
channels".  Shortly after a message appeared that third party sources
had been disabled in my sources.list file, the upgrade stopped with this
error.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.17
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Sun Aug 24 09:10:42 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1408896091
 com.ubuntu.update-manager window-height 1176
 com.ubuntu.update-manager window-width 1855
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
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 2014-08-24 (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/1360848

Title:
  upgrade crashes with "Could not calculate the upgrade"

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  "Could not calculate upgrade" error aborts the software upgrade from
  Ubuntu 12.04.5 LTS to 14.04 LTS

  The upgrade was proceeding through step 2 "Setting new software
  channels".  Shortly after a message appeared that third party sources
  had been disabled in my sources.list file, the upgrade stopped with
  this error.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  Uname: Linux 3.5.0-18-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  Date: Sun Aug 24 09:10:42 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1408896091
   com.ubuntu.update-manager window-height 1176
   com.ubuntu.update-manager window-width 1855
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  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 2014-08-24 (0 days ago)
  VarLogDistupgradeTermlog:

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