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

Failed to download repository information

Check your Internet connection.

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

My internet connection works well.
What are this updates and why it fails?

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marked as duplicate by fossfreedom Oct 28 '12 at 20:21

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.

up vote 4 down vote accepted

You have added the Ubuntu-X team X Updates PPA (ppa:ubuntu-x-swat/x-updates) to your packages sources. This PPA doesn't contain any packages for Ubuntu 12.10.

Just remove it from your package sources. See "How can PPAs be removed?" if you don't know how to do this.

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