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I am working on 12.04 and while I am trying to install the updates, some of them were downloaded but others failed by displaying a message that said:

Failed to downloaded packages & check your Internet connection.

Also when I tried to change the server to main, the following details are given to me:

Failed to fetch 404  Not Found [IP: 80]
Failed to fetch 404  Not Found [IP: 80]

How can I fix this problem?

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This is usually a sign that you need to update your package list (sudo apt-get update). Repos clean out their old packages so if you don't update before doing things, you'll end up trying to download old packages.

In this instance, Thunderbird is now version 15.

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