[Bug 1483742] [NEW] do-release-upgrade 12.04 fails

[Paul Marxhausen]

Public bug reported:

Stable, well maintained, plain-vanilla 12.04 web server failed the "do-
release-upgrade" procedure to 14.04 while calculating the differences.
Message  "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 report this bug using the 
command "ubuntu-bug ubuntu-release-upgrader-core""

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager (not installed)
ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
Uname: Linux 3.2.0-39-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.9
Architecture: amd64
Date: Tue Aug 11 08:19:07 2015
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 LANG=POSIX
 SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2015-08-11 (0 days ago)

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


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

** Attachment added: "logs.zip"
   https://bugs.launchpad.net/bugs/1483742/+attachment/4442893/+files/logs.zip

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https://bugs.launchpad.net/bugs/1483742

Title:
  do-release-upgrade 12.04 fails

Status in update-manager package in Ubuntu:
  New

Bug description:
  Stable, well maintained, plain-vanilla 12.04 web server failed the
  "do-release-upgrade" procedure to 14.04 while calculating the
  differences.  Message  "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 report this bug using the 
  command "ubuntu-bug ubuntu-release-upgrader-core""

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager (not installed)
  ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
  Uname: Linux 3.2.0-39-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.9
  Architecture: amd64
  Date: Tue Aug 11 08:19:07 2015
  MarkForUpload: True
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=POSIX
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2015-08-11 (0 days ago)

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