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First, let it be known that it has been quite some time since I upgraded this particular server.

When I execute sudo apt-get update most of the endpoints seem to be reached fine. However there are a few rather disconcerting misses:

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

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

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

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

E: Some index files failed to download. They have been ignored, or old ones used instead.

If I try to move ahead with the sudo apt-get upgrade I get tons of errors looking like the following and nothing updates:

Err natty-updates/main libc6 amd64 2.13-0ubuntu13.2
403  Forbidden

Is my servers sources list pointing to the wrong server or something?

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up vote 5 down vote accepted

According to the list of Ubuntu releases, Natty Narwhal hit end-of-life on Oct. 28, 2012 and is no longer supported.

Here is the announcement.

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That will certainly do it. An upgrade to 12.04 is in order I suppose, I hope its not too much of a pain. – Hersheezy Aug 5 '13 at 18:23

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