[Bug 1656015] Re: Upgrade from 12.04 to 14.04.5 was failed

[Ubuntu Foundations Team Bug Bot]

** Tags added: precise2trusty

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Title:
  Upgrade from 12.04 to 14.04.5 was failed

Status in update-manager package in Ubuntu:
  New

Bug description:
  I typed:
  $ sudo do-release-upgrade

  but unfortunately it was failed with error "An unresolvable problem
  occured while calculating the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.21
  ProcVersionSignature: Ubuntu 3.13.0-107.154~precise1-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-107-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.15
  Architecture: amd64
  Date: Thu Jan 12 17:02:14 2017
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=linux
   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 2017-01-12 (0 days ago)

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