Ubuntu 配置 国内更新源

之所以要换成国内的 就是因为国外的源太慢了视频链接地址：

1.百度搜索 “ubuntu 16.04 更新国内源”2.编辑 /etc/apt/sources.list  #sudo  vim /etc/apt/sources.list    我们来清空内容：  shift + ： 1，$ d  再按i 进行编辑  复制我们刚才找的源内容 然后粘贴##阿里云deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse##测试版源deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse# 源码deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse##测试版源deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse# Canonical 合作伙伴和附加deb http://archive.canonical.com/ubuntu/ xenial partnerdeb http://extras.ubuntu.com/ubuntu/ xenial main ###清华大学deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty main restricted universe multiversedeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-security main restricted universe multiversedeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-updates main restricted universe multiversedeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-backports main restricted universe multiversedeb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-proposed main restricted universe multiversedeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty main restricted universe multiversedeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-security main restricted universe multiversedeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-updates main restricted universe multiversedeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-backports main restricted universe multiversedeb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-proposed main restricted universe multiverse  如果提示没有vim  那么先执行 sudo apt install vim  按一下ESC，  然后shift + ： 输入wq 保存退出3.更新缓存资源索引    sudo apt update   看到已经换成阿里的了，等待更新完成