Ubuntu12.04 更新源

一、首先备份Ubuntu 12.04源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份下当前的源列表，有备无患嘛）
二、修改更新源
sudo gedit /etc/apt/sources.list （打开Ubuntu 12.04源列表文件）
三、将下面的代码粘贴进去（“#”开头的那一行为注释，能够直接复制进文件中）

四、通知ubuntu启用新的更新源   sudo apt-get update

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