[Bug 1388884] Re: Can't upgrade fro Ubuntu 12.04.05 LTS to 14.04.1 LTS though I disabled all external repositories in sources.list and deleted sources.list.d folder

[Kunal Shah]

This is the error I receive in step 2 (Setting new software channels):

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.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1388884

Title:
  Can't upgrade fro Ubuntu 12.04.05 LTS to 14.04.1 LTS though I disabled
  all external repositories in sources.list and deleted sources.list.d
  folder

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  I have been trying constantly and failing each time when I try to upgrade fro Ubuntu 12.04.05 LTS to 14.04.1 LTS.
  I disabled all external repositories in sources.list and deleted sources.list.d folder so I don't see any error in the upgrade manager but the upgrade doesn't work.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.13.0-39.66~precise1-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: amd64
  Date: Mon Nov  3 07:27:54 2014
  GsettingsChanges:
   
  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 2014-11-03 (0 days ago)
  VarLogDistupgradeTermlog:

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1388884/+subscriptions