Unable to run update to 11.10

[Davros Mandrake]

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

I have removed the google repository as this was my only 3rd party source that I could tell. This stopped a message about 3rd party sources but did not fix the issue.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.3
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CurrentDmesg.txt:
 [ 36.990009] eth0: no IPv6 routers present
 [ 61.761717] EXT4-fs (sda7): re-mounted. Opts: errors=remount-ro,commit=0
 [ 475.791948] exe (3987): /proc/3987/oom_adj is deprecated, please use /proc/3987/oom_score_adj instead.
Date: Tue Oct 18 17:37:54 2011
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /apps/update-manager/window_size=(600,570)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-10-18 (0 days ago)

[Jean-Baptiste Lallement (jibel)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add the log files from '/var/log/dist-upgrade/' to this bug report as separate attachments? Thanks in advance.

[Davros Mandrake (davros)]

As Requested the contents of var\log\dist-upgrade. There are sub folders I have not included but these appear to be log files of the multiple times I have tried. I have not included them here.

My other machine (a laptop and only 32bit) upgraded with no issue. This machine though has been running Ubuntu through a few upgrades. Everything installed has come from the trusted software source with the exception of some Citrix (XenApp Client) that I tried to get working for work. (It had issues with 64 bit)

Will I have to install from Disk to get this system to 11.10? Is it more helpful for me to leave my machine in this state to help the bug fixing process?