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When I'm trying to make update (with apt-get update) in Debian 7 I always have errors like this:

W: Failed to fetch http://security.debian.org/dists/wheezy/updates/non-free/binary-amd64/Packages 404 Not Found

I tried changing servers in sources.list but nothing works

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Try apt-get clean. That should clean the cache and then you should be able to do apt-get update.

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