[Bug 1085679] [NEW] Error during update 11.10 to 12.04 LTS

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When i tried to upgrade my 11.10 to 12.04 LTS through "upgrade manager" or "terminal (cmd: do-release-upgrade)", the following error messages getting displayed where-as other updates(recommended by upgrade manager) are updated successfully.
I am using ZTE Blade (android mobile) for network connection. This error message is displayed at 11.10 to 12.04LTS upgrade operation only.

Expexcted result: upgrade should be successful.
Actual result: error during update.


error message in terminal: 
------------------------------------

Error during update

A problem occurred during the update. This is usually some sort of 
network problem, please check your network connection and retry. 

W:Failed to fetch 
gzip:/var/lib/apt/lists/partial/in.archive.ubuntu.com_ubuntu_dists_precise_universe_binary-i386_Packages 
Hash Sum mismatch 
, E:Some index files failed to download. They have been ignored, or 
old ones used instead. 


Restoring original system state

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-terminal 3.0.1-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-28.45-generic 3.0.51
Uname: Linux 3.0.0-28-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Dec  2 22:57:55 2012
ExecutablePath: /usr/bin/gnome-terminal
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=en_IN:en
 LANG=en_IN
SourcePackage: gnome-terminal
UpgradeStatus: Upgraded to oneiric on 2012-12-02 (0 days ago)

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


** Tags: apport-bug apport-lpi dist-upgrade i386 oneiric running-unity
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Error during update 11.10 to 12.04 LTS
https://bugs.launchpad.net/bugs/1085679
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