我当前的版本是natty.有天提示有更新，于是我就直接摁了。谁知道出现下面错误：
W:无法下载 gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_multiverse_binary-i386_Packages Hash 校验和不符
, E:Some index files failed to download. They have been ignored, or old ones used instead.
后面在ubuntu官方论坛里找到一方法：
cd /var/lib/apt/lists/partial/
sudo rs -f *.*
sudo apt-get update