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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 was marked as an exact duplicate of an existing 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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