1. 备份

    sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

    2.修改

    sudo vim /etc/apt/sources.list


    将source.list文件内容替换成下面的

    deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

    deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

    deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse

    deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse

    deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse

    deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

    deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

    3. 更新

    sudo apt-get update