[Bug 1832920] Re: An unresolvable problem occurred while calculating the upgrade.

[Ubuntu Foundations Team Bug Bot]

** Tags added: precise2trusty

** Tags added: third-party-packages

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https://bugs.launchpad.net/bugs/1832920

Title:
  An unresolvable problem occurred while calculating the upgrade.

Status in update-manager package in Ubuntu:
  New

Bug description:
  not able to upgrade from 12.04 to 14.04.the error message is 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

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.22
  ProcVersionSignature: Ubuntu 3.13.0-117.164~precise1-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-117-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.15
  Architecture: amd64
  Date: Sat Jun 15 04:21:26 2019
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1560551870
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 500
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_IN:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2019-06-14 (0 days ago)

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