ubuntu 8.04 更改更新源

    1、先备份
    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）

    2、修改更新源
    sudo gedit /etc/apt/sources.list （打开Ubuntu 8.04源列表文件）

    在最下面加入
    deb http://ubuntu.cn99.com/ubuntu/ hardy main restricted universe multiverse
    deb http://ubuntu.cn99.com/ubuntu/ hardy-security main restricted universe multiverse
    deb http://ubuntu.cn99.com/ubuntu/ hardy-updates main restricted universe multiverse
    deb http://ubuntu.cn99.com/ubuntu/ hardy-proposed main restricted universe multiverse
    deb http://ubuntu.cn99.com/ubuntu/ hardy-backports main restricted universe multiverse
    deb-src http://ubuntu.cn99.com/ubuntu/ hardy main restricted universe multiverse
    deb-src http://ubuntu.cn99.com/ubuntu/ hardy-security main restricted universe multiverse
    deb-src http://ubuntu.cn99.com/ubuntu/ hardy-updates main restricted universe multiverse
    deb-src http://ubuntu.cn99.com/ubuntu/ hardy-proposed main restricted universe multiverse
    deb-src http://ubuntu.cn99.com/ubuntu/ hardy-backports main restricted universe multiverse

    3、通知 ubuntu 8.40 启用新的更新源
    sudo apt-get update