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This question already has an answer here:

My update manager doesn't work and comes up with this:

please 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.

but my internet connection is fine please help.

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marked as duplicate by Jorge Castro, Avinash Raj, Warren Hill, Lucio, belacqua Feb 28 '14 at 21:09

This question was marked as an exact duplicate of an existing question.

ive even plugged in my laptop in to a ethernet port – user125278 Jan 22 '13 at 22:20

Generally, when you get a PPA error message like that, it means the developer's package you want is not available for your specific version of Ubuntu.

Looking in the "java" directory of the PPA link your package manager failed to find, we see:

The distribution directory of the "java" archive

It looks like ferramroberto does not offer a quantal version of this package yet.

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