linux mint update error

ERROR###ERROR###ERROR###ERROR###ERROR###ERROR###ERROR
W:Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_raring-security_main_binary-amd64_Packages  Hash Sum mismatch
, E:Some index files failed to download. They have been ignored, or old ones used instead.


sudo apt-get clean
cd /var/lib/apt
sudo  mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean
sudo apt-get update
http://ubuntuforums.org/showthread.php?t=1983220