[Bug 1534128] [NEW] upgrading from 14.04 to 15.04 is failed why?

[banda_mohammod_al_helal]

Public bug reported:

i try to upgrade to ubuntu 15.04 from 14.04 LTS.when upgrading shows
error ""Can't install 'ubuntu-desktop'

It was impossible to install a required package. Please report this as a
bug using '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 3.19.0-43.49~14.04.1-generic 3.19.8-ckt10
Uname: Linux 3.19.0-43-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu Jan 14 18:16:33 2016
InstallationDate: Installed on 2015-12-18 (26 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-14 (0 days ago)
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update.manager.release.upgrades: 2016-01-11T22:31:33.456673

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


** Tags: apport-bug dist-upgrade i386 third-party-packages trusty

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https://bugs.launchpad.net/bugs/1534128

Title:
  upgrading from 14.04 to 15.04 is failed why?

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

Bug description:
  i try to upgrade to ubuntu 15.04 from 14.04 LTS.when upgrading shows
  error ""Can't install 'ubuntu-desktop'

  It was impossible to install a required package. Please report this as
  a bug using '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 3.19.0-43.49~14.04.1-generic 3.19.8-ckt10
  Uname: Linux 3.19.0-43-generic i686
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Jan 14 18:16:33 2016
  InstallationDate: Installed on 2015-12-18 (26 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-14 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-11T22:31:33.456673

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