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Possible Duplicate:
How to install software or upgrade from old unsupported release?

While I'm upgrading my Ubuntu from 12.04 to 12.10 the following error is occurred in distribution upgrade,

W:Failed to fetch

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

Does anybody know whats happening?

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marked as duplicate by Jorge Castro, fossfreedom Dec 13 '12 at 20:36

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.

Maverick is not 12.04 is 10.10, why do you have the Maverick repositories enabled? did you upgraded from previous versions? – Uri Herrera Dec 13 '12 at 4:42
Yep, I've upgraded the maverick to 12.04. Please tell me how to disable the maverick repositories. – Karan Singh Dec 13 '12 at 5:12

Maverick is no longer supported. Remove references to maverick repositories from /etc/apt/sources.list and from files in /etc/apt/sources.list.d/. Make sure that you still have references to quantal. After editing these files, run sudo apt-get update.

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Thanks, I've removed the repositories and it's started to upgrade. – Karan Singh Dec 13 '12 at 5:30

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