[Bug 1413936] Re: upgrade from 12.04 LTS to 14.04 fails

[Dmitry Kan]

Uninstalling cinnamon package has helped to solve the issue. Thanks.

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Title:
  upgrade from 12.04 LTS to 14.04 fails

Status in update-manager package in Ubuntu:
  New

Bug description:
  Please let me know, in case more information is needed on the sw / hw
  side. Thanks.

  Description:	Ubuntu 12.04.5 LTS
  Release:	12.04

  update-manager:
    Installed: 1:0.156.14.17
    Candidate: 1:0.196.12
    Version table:
       1:0.196.12 0
          500 http://www.nic.funet.fi/pub/mirrors/archive.ubuntu.com/ trusty-updates/main amd64 Packages
       1:0.196.11 0
          500 http://www.nic.funet.fi/pub/mirrors/archive.ubuntu.com/ trusty/main amd64 Packages
   *** 1:0.156.14.17 0
          100 /var/lib/dpkg/status

  
  Instead of upgrading, the manager outputs:

  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

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-76.111-generic 3.2.66
  Uname: Linux 3.2.0-76-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Date: Fri Jan 23 11:55:49 2015
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  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 2015-01-23 (0 days ago)
  VarLogDistupgradeTermlog:

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