wget -qO - mirrors.ubuntu.com/mirrors.txt

    http://mirrors.aliyun.com/ubuntu/

    1. sudo sed -i 's/http:\/\/us.archive.ubuntu.com\/ubuntu\//http:\/\/ubuntu.uberglobalmirror.com\/archive\//' /etc/apt/sources.list
    3. sudo cp /etc/apt/sources.list /etc/apt/sources.list
    4. sudo sed -i 's@http://archive.ubuntu.com/ubuntu@http://mirrors.aliyun.com/ubuntu@g' /etc/apt/sources.list