I think most of you will encounter with this kind of problem if you are using the previous version of Ubuntu.

W: Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_natty_main_source_Sources  Hash Sum mismatch, 
E: Some index files failed to download. They have been ignored, or old ones used instead.

The solution is to remove the content of /var/lib/apt/lists directory:

sudo rm /var/lib/apt/lists/*

then run:

sudo apt-get update

Credit to askubuntu.com

By zam

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