在Ubuntu服务器上运行" apt-get更新"时遇到以下错误？

W: Failed to fetch http://ca.archive.ubuntu.com/ubuntu/dist/precise/restricted/source/Sources Hash Sum mismatch
E: Some indes files failed to download. They haev been ignored, or old ones used instead.

只需运行以下命令：

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

并再次运行update命令：

sudo apt-get update