Thanks for this additional information.

The problem seems to be that you have a bunch of duplicated entries in your 
/etc/apt/sources.list (and possible /etc/apt/sources.list.d) files.
Did you edited those manually or used tools (like the Software Properties 
window or synaptics repository editor)? It maybe that there is a bug in those 
tools that makes the duplicates. The bug here is that apt is double queuing 
those sources. 

A simple workaround is to comment out or more most of those sources.
Please try to replace your /etc/apt/sources.list file with the one
attached and remove anything in /etc/apt/sources.list.d

(make a backup of your /etc/apt/sources.list first please).

** Attachment added: "sources.list"
   http://librarian.launchpad.net/7364070/sources.list

-- 
Edgy > Feisty Alt CD upgrade update-manager fails
https://bugs.launchpad.net/bugs/107881
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