Linux拥有众多的发行版，每个发行版都有提供镜像，但是，有些镜像的下载速度参差不齐，偶尔会有更新失败的情况。
下面以修改 Ubuntu 软件源为中科大为例进行说明。
镜像地址：https://mirrors.ustc.edu.cn/
网站资讯
渠道合作
解决方案
更多服务# cp /etc/apt/sources.list /etc/apt/sources.list.backup编辑/etc/apt/sources.list文件, 将内容修改为：
Xenial(16.04)
deb https://mirrors.ustc.edu.cn/ubuntu/ xenial main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ xenial universedeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates universedeb https://mirrors.ustc.edu.cn/ubuntu/ xenial multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-updates multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security universedeb https://mirrors.ustc.edu.cn/ubuntu/ xenial-security multiverseTrusty(14.04)
deb https://mirrors.ustc.edu.cn/ubuntu/ trusty main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-updates main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ trusty universedeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-updates universedeb https://mirrors.ustc.edu.cn/ubuntu/ trusty multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-updates multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-backports main restricted universe multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-security main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-security universedeb https://mirrors.ustc.edu.cn/ubuntu/ trusty-security multiversePrecise(12.04)
deb https://mirrors.ustc.edu.cn/ubuntu/ precise main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ precise-updates main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ precise universedeb https://mirrors.ustc.edu.cn/ubuntu/ precise-updates universedeb https://mirrors.ustc.edu.cn/ubuntu/ precise multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ precise-updates multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiversedeb https://mirrors.ustc.edu.cn/ubuntu/ precise-security main restricteddeb https://mirrors.ustc.edu.cn/ubuntu/ precise-security universedeb https://mirrors.ustc.edu.cn/ubuntu/ precise-security multiverse# apt-get update
