Ubuntu upgrade from 10.04 to 10.10 fail

[adebayo]

I try to update from Ubuntu 10.04 to 10.10 or from 10.04 to 12.04 but never succeeded. I used update-manager it failled, I then used the following command command prompt and try to upgrade again it still failed,

>sudo apt-get update && sudo apt-get upgrad
>sudo apt-get dist-upgrade

All the third party software in source.list are disable, I try off offline iso alternative cd, yet all failed

>sudo unmount -o loop /home/adebayo/Downloads/ubuntu-10.10-alternate-i386.iso /media/cdrom
>sudo sh /media/cdrom/cdromupgrade

Some o the error messages are:An unresolvable problem occurred while calculating the upgrade:
E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held 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

Please help out. Thanks

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.12.1
ProcVersionSignature: Ubuntu 2.6.32-41.91-generic 2.6.32.59+drm33.24
Uname: Linux 2.6.32-41-generic i686
Architecture: i386
Date: Thu Jul 12 07:19:15 2012
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=false
 /apps/update-manager/show_versions=false
 /apps/update-manager/window_size=(600,600)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_NG
 SHELL=/bin/bash
SourcePackage: update-manager
VarLogDistupgradeTermlog:

[dino99 (9d9)]

This version is no more supported