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This is the following error:

     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.
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All this means is that the file was not found on the server... Punch it in to your browser and you will see that it was not found. Try and clear out your apt-get cache. sudo apt-get clean – Matt Clark Dec 23 '12 at 17:53
I tried that but it gave me same error after trying update again. – user1463542 Dec 23 '12 at 18:09
I am trying to download Java from here:… – user1463542 Dec 23 '12 at 18:10

Try doing update.Assuming you are trying to install java

Try this

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
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Well I can't do update. that'S the problem. – user1463542 Dec 23 '12 at 18:13
can you post the complete sequence of commands – daya Dec 23 '12 at 18:13
sudo add-apt-repository ppa:webupd8team/java worked fine. – user1463542 Dec 23 '12 at 18:14
but sudo apt-get update gave me the error up in the question. – user1463542 Dec 23 '12 at 18:15
open this in your browser… you can see quantal(12.10 is not listed) perhaps you will have to use some other repository, otherwise browse inside the existing release folders, download .deb file and then install it – daya Dec 23 '12 at 18:18

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