修改修改ubuntu 18.04的的sources.list源为阿里或清华镜像的方法源为阿里或清华镜像的方法
1. 备份源列表备份源列表
Ubuntu缺省的配置的源并不是国内的服务器，下载更新软件都比较慢，本文介绍如何设置源列表，选择比较快的源以节省下
载时间。
# 首先备份源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
2. 打开打开sources.list文件修改文件修改
选择合适的源，替换原文件的内容，保存编辑好的文件, 以阿里云更新服务器为例（从实际测试上结果分析，个人认为阿里云
比网易和搜狐的服务器要快）：
sudo vim /etc/apt/sources.list
3. 阿里云镜像源阿里云镜像源-清华镜像源清华镜像源
注意根据具体使用的Ubuntu的版本不同，将文本中trusty替换为下面对应版本的字符串:
版本版本 版本号版本号 代号代号
Lucid(10.04) 10.04 lucid
Precise(12.04): precise 12.04 precise
Trusty(14.04): trusty 14.04 trusty
Utopic(14.10): utopic 14.10 utopic
Ubuntu 16.04 TLS：
xenial
16.04 xenial
Ubuntu 18.04 TLS：
bionic
18.04 bionic
Ubuntu 18.04 TLS版本阿里云镜像源：
# https://opsx.alibaba.com/mirror
deb https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
# 仿照清华镜像源，注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
# deb-src https://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
Ubuntu 18.04 TLS版本清华镜像源：
# https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
4. 刷新列表，一定要执行刷新刷新列表，一定要执行刷新
sudo apt-get update
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