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I am still using 10.10 because I have had no reason to upgrade. At this point, I need some of the newer packages so I need to upgrade. I tried upgrading to 11.04 (the only version that update manager gives me...) and it fails with this:

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.

Please help me.

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marked as duplicate by Uri Herrera, bodhi.zazen, dobey, fossfreedom Feb 6 '13 at 22:15

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.

The error that you get (404) is detailed in this previous question. Read the answers to solve the issue. – Lucio Feb 6 '13 at 22:14
About Why you can't upgrade to newest version than 11.04 read this question where is explained very well. – Lucio Feb 6 '13 at 22:18

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