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Possible Duplicate:
Trouble downloading updates due to “Hash sum mismatch” error

Every time I try to update my system I get these messages:

W:Failed to fetch bzip2:/var/lib/apt/lists/partial/it.archive.ubuntu.com_ubuntu_dists_precise-updates_universe_binary-amd64_Packages  Hash Sum mismatch
E:Some index files failed to download. They have been ignored, or old ones used instead.

I'm using Ubuntu 12.04 LTS. I don't understand what this message is about or what the problem is.

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I solved using these commands:

sudo rm -rf /var/lib/apt/lists/*
sudo apt-get update
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