[Bug 1545208] [NEW] upgrader shows error : pre release version of ubuntu is running , so it cant continue

[Xeon]

Public bug reported:

The upgrader stops after setting up channels.
shows the message :
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 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-78.122-generic 3.13.11-ckt33
Uname: Linux 3.13.0-78-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Feb 13 05:38:13 2016
InstallationDate: Installed on 2014-05-31 (622 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-02-13 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update.manager.release.upgrades:
2016-02-13T04:58:52.422310

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade trusty

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https://bugs.launchpad.net/bugs/1545208

Title:
  upgrader shows error : pre release version of ubuntu is running , so
  it cant continue

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  The upgrader stops after setting up channels.
  shows the message :
  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 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-78.122-generic 3.13.11-ckt33
  Uname: Linux 3.13.0-78-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Feb 13 05:38:13 2016
  InstallationDate: Installed on 2014-05-31 (622 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-02-13 (0 days ago)
  VarLogDistupgradeTermlog:

  mtime.conffile..etc.update.manager.release.upgrades:
  2016-02-13T04:58:52.422310

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