Ubuntu系统自带的源都是国外的网址，国内用户在使用的时候网速比较慢。一个软件的下载是十分痛苦的，这里讲解一下如何将国外源更换为国内源，让你的网速Biu.Biu.Biu。
更换apt-get数据源
1.备份原先的源
sudo cp /etc/apt/sources.list /etc/apt/sources.list.back_20181007
将以前的源备份一下，以防以后可以用的。
2.更换源
sudo gedit /etc/apt/sources.list
使用gedit打开文档，将下边的阿里源复制进去，然后点击保存关闭。
阿里源
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
3.更新源与软件
更新源
sudo apt-get update
更新软件
sudo apt-get upgrade
4.其他常用源
西电源（只有校内网网线使用，但是不限制流量，还是十分靠谱的）
deb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial main restricted universe multiverse#deb-srchttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial main restricted universe multiversedeb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-security main restricted universe multiverse#deb-srchttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-security main restricted universe multiversedeb http://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-updates main restricted universe multiverse#deb-srchttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-updates main restricted universe multiverse#debhttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-backports main restricted universe multiverse#deb-srchttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-backports main restricted universe multiverse#debhttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-proposed main restricted universe multiverse#deb-srchttp://linux.xidian.edu.cn/mirrors/ubuntu/ xenial-proposed main restricted universe multiverse
清华源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
网易源
deb http://mirrors.163.com/ubuntu/ wily main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiversedeb-srchttp://mirrors.163.com/ubuntu/ wily main restricted universe multiversedeb-srchttp://mirrors.163.com/ubuntu/ wily-security main restricted universe multiversedeb-srchttp://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiversedeb-srchttp://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiversedeb-srch ttp://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse
参考网址:https://blog.csdn.net/qq_35451572/article/details/79516563
更换pip数据源
1.根目录创建.pip文件
mkdir ~/.pip
2.创建文件pip.conf
vim .pip/pip.conf
3.点击“i”键，进入编辑模式，复制以下信息：
[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
trusted-host = pypi.tuna.tsinghua.edu.cn
4.点击：“ESC”切换到命令行模式，输入“:wq”保存离开。
5.其他常用源
清华大学 https://pypi.tuna.tsinghua.edu.cn/simple/
阿里云 http://mirrors.aliyun.com/pypi/simple/
中国科技大学 https://pypi.mirrors.ustc.edu.cn/simple/
豆瓣(douban) http://pypi.douban.com/simple/
