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

I had to reinstall Ubuntu 10.10.

Now i can not install programs (flash, chromium...)

The computer shows this message:

W:Failed to fetch  404  Not Found
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marked as duplicate by Uri Herrera, Tom Brossman, fabricator4, devav2, hhlp Dec 23 '12 at 11:22

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

@Juanjo the version of Ubuntu you are using is simply too old. The best thing for you to do is copy all your data to an external drive, then reinstall version 12.04 or 12.10. – Tom Brossman Dec 23 '12 at 10:16
@EliahKagan - looks like a correct dupe - dupe shows how to install EoL applications. – fossfreedom Dec 23 '12 at 12:19
@fossfreedom You're quite right! Sorry, folks. – Eliah Kagan Dec 23 '12 at 12:26

Ubuntu 10.10(Maverick Meerkat) had reached end of life on April 10 2012. Its repositories is no longer maintained, as you can see at this link. You have to install a currently supported Ubuntu version, preferably 12.04 LTS or 12.10.

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