[Bug 999001] [NEW] Can't able to upgrade ubuntu 11.10 to 12.04

[sushil]

Public bug reported:

An unresolvable problem occurred while calculating the upgrade:
E:Unable to correct problems, you have held broken packages.

 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 update-manager' in a terminal.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: update-manager 1:0.152.25.9
ProcVersionSignature: Ubuntu 3.0.0-19.33-generic-pae 3.0.27
Uname: Linux 3.0.0-19-generic-pae i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Mon May 14 12:15:09 2012
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to oneiric on 2012-05-14 (0 days ago)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug dist-upgrade i386 oneiric running-unity

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https://bugs.launchpad.net/bugs/999001

Title:
  Can't able to upgrade ubuntu 11.10 to 12.04

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

Bug description:
  An unresolvable problem occurred while calculating the upgrade:
  E:Unable to correct problems, you have held broken packages.

   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 update-manager' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: update-manager 1:0.152.25.9
  ProcVersionSignature: Ubuntu 3.0.0-19.33-generic-pae 3.0.27
  Uname: Linux 3.0.0-19-generic-pae i686
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  Date: Mon May 14 12:15:09 2012
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to oneiric on 2012-05-14 (0 days ago)

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