I execute "update-manager -d" from shell.

The following info windows were displayed, text of the windows as below
:

---------- Message Window 1 ----------------------

Third party sources disabled

Some third party entries in your sources.list were disabled. You can 
re-enable them after the upgrade with the 'software-properties' tool or 
your package manager.

----------- Message Window 2 -------------------------
Could not calculate the upgrade

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

If none of this applies, then please report this bug using the command 
'ubuntu-bug update-manager' in a terminal.

--------------------

I have no clue if any of the above reason are applicable to my
installation.

Could you let me know if I have to do anything different.

regards


On Tuesday 06 September 2011 02:49 PM, Robert Roth wrote:
> Could you please try switching to another server in the software sources 
> (click settings on the update-manager window) and see if it helps?
> ---
> Ubuntu Bug Squad volunteer triager
> http://wiki.ubuntu.com/BugSquad
>
> ** Changed in: update-manager (Ubuntu)
>         Status: New =>  Incomplete
>

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https://bugs.launchpad.net/bugs/842438

Title:
  cannot upgrade to 11.10 from 11.04

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