[Bug 1355887] Re: 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

[Brian Murray]

*** This bug is a duplicate of bug 1308338 ***
    https://bugs.launchpad.net/bugs/1308338

** This bug has been marked a duplicate of bug 1308338
   Ubuntu 12.04 LTS -> 14.04 LTS upgrade fails if Flight Gear installed

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https://bugs.launchpad.net/bugs/1355887

Title:
  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

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 12.04.5 LTS
  Release:	12.04

  Upgrading to 14.04.01 Trusty Tahr via upgrade tool gives this message

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.13.0-33.58~precise1-generic 3.13.11.4
  Uname: Linux 3.13.0-33-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Tue Aug 12 17:58:55 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1407855382
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 604
   com.ubuntu.update-manager window-width 500
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  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 2014-08-12 (0 days ago)
  VarLogDistupgradeTermlog:

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