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I want to download updates but I get this error message:

Das Herunterladen der Paketdateien ist gescheitert...
Failed to fetch 404  Not Found [IP: 80]...

If I enter into a browser window, I can see gnome-control-center-data_3.4.2-0ubuntu0.4_all.deb, but not gnome-control-center-data_3.4.2-0ubuntu0.3_all.deb (observe bold 4, 3!).

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It's best to try again in a few hours, the servers are probably being updated with new packages – Cumulus007 Aug 10 '12 at 20:12
The package lists are probably out of date. Run sudo apt-get update and try again. – Eric Carvalho Aug 10 '12 at 20:55
@EricCarvalho I recommend posting this as an answer. (Even if it doesn't work for this OP, it works in most similar situations. And it will almost certainly work here, because the problem is that the server's version is newer than the version known about on the local machine.) – Eliah Kagan Aug 10 '12 at 21:54

If the above works then ok...
I had the same problem.

Try this:

sudo rm /var/lib/apt/lists/* -vf
sudo apt-get update

Hope it works for you.

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