Ubuntu12.04 更新源

一、首先備份Ubuntu 12.04源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （備份下當前的源列表，有備無患嘛）
二、修改更新源
sudo gedit /etc/apt/sources.list （打開Ubuntu 12.04源列表文件）
三、將下面的代碼粘貼進去（「#」開頭的那一行爲註釋，能夠直接複製進文件中）

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

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