[Bug 1651240] Re: Unable to upgrade from 12.04 to 14.04

[wangyongming]

** Changed in: update-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1651240

Title:
  Unable to upgrade from 12.04 to 14.04

Status in update-manager package in Ubuntu:
  Incomplete

Bug description:
  Unable to upgrade from 12.04 to 14.04.

  Error message says "Unable to calculate changes, may be due to pre-
  release versions or unofficial software packages."

  Neither should be the case in this instance.

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.21
  ProcVersionSignature: Ubuntu 3.2.0-119.162-generic-pae 3.2.79
  Uname: Linux 3.2.0-119-generic-pae i686
  ApportVersion: 2.0.1-0ubuntu17.15
  Architecture: i386
  Date: Mon Dec 19 15:58:57 2016
  EcryptfsInUse: Yes
  GsettingsChanges:
   com.ubuntu.update-manager check-new-release-ignore 'trusty'
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1482180481
   com.ubuntu.update-manager window-height 535
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  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 2016-12-19 (0 days ago)

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