[Bug 1357005] Re: release upgrade fails on some aptcdrom atribute error

[cavh]

I encountered this bug on trying to upgrade from Precise to Trusty and
was able to move on from this error by deselecting all those PPAs (by
means of  the graphical interface) which referred to 'precise' as the
distribution.

I then ran 'sudo do-release-upgrade' and the upgrade proceeded as usual.

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https://bugs.launchpad.net/bugs/1357005

Title:
  release upgrade fails on some aptcdrom atribute error

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  Release upgrade error to 14.04

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-67.101-generic 3.2.60
  Uname: Linux 3.2.0-67-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Thu Aug 14 10:46:19 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1408038304
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 717
   com.ubuntu.update-manager window-width 512
  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 2014-08-14 (0 days ago)
  VarLogDistupgradeTermlog:

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