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I can't update my ubuntu 12.04. I tried it from terminal, update manager and also from the synaptic package manager. The error is

W: Failed to fetch  Unable to connect to
W: Failed to fetch  Unable to connect to
E: Some index files failed to download. They have been ignored, or old ones used instead.
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It seems there's a problem with the server mirror you are using.

One possible option would be to open Update Manager; click the Settings button; under the "Ubuntu Software" tab choose a different "Download from" Server.

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Just like a browser can show a error message a Update Manger can also do it.

You can stop update it if theres nothing you can do. by remove a software source

also chose another mirror can help you,maybe server you chosen was down.

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