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经常遇到Ubuntu系统默认的apt-get 配置源网络不好导致安装或者更新软件时卡很久， 因此更换国内镜像源时很有必要的

以下是本人常用的163 镜像源(在线记录用)

deb http://mirrors.163.com/ubuntu/ xenial main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ xenial main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse

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