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Possible Duplicate:
How can I fix a 404 Error using a PPA?

I get the following error message when I try to check for updates:

W:Failed to fetch  404  Not Found
W:Failed to fetch  404  Not Found
W:Failed to fetch  404  Not Found
W:Failed to fetch  404  Not Found
E:Some index files failed to download. They have been ignored, or old ones used instead.

What can I do to correct this? This is a new installation of Natty. I installed updates only once, and subsequently I have only received this error message when trying to check for more updates.

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marked as duplicate by James Feb 23 '12 at 14:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Have you tried sudo apt-get update && sudo apt-get upgrade – Nitin Venkatesh Sep 16 '11 at 10:20
It is a new installation but you had the time to broke your sources list with a wrong ppa. Anyway this should not prevent the upgrade, unless you completely compromised your sources list. – enzotib Sep 16 '11 at 10:22

Your have an invalid entry in your sources. It can't imagina how can this happen in a new installation. Anyway:

  1. Open the Software Centre
  2. Click on the Edit menu, select Software Sources.
  3. A new window will open, select the "Other Software" tab
  4. Uncheck everything but "Canonical Partners" and "Independent"

enter image description here

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it may happened because of some reasons:

  1. your internet connection.
  2. your apt source.list file corrupted.
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