Ubuntu更新国内源
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Ubuntu系统默认的软件更新源服务器是在国外的，速度缓慢，让人煎熬，有时候索性就报错不能使用了。感谢国内大厂和机构提供了速度较快的国内镜像源服务，下面我们来使用阿里云配置系统的软件更新源。
一，访问阿里云开源镜像
打开阿里云开源镜像站：http://mirrors.aliyun.com/，跳转到如下页面：
点击ubuntu，跳转到如下页面：
向下找到相应版本操作系统的配置，复制即可（这里以16.04为例）
deb https://mirrors.aliyun.com/ubuntu/ xenial main
deb-src https://mirrors.aliyun.com/ubuntu/ xenial main
deb https://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb-src https://mirrors.aliyun.com/ubuntu/ xenial-updates main
deb https://mirrors.aliyun.com/ubuntu/ xenial universe
deb-src https://mirrors.aliyun.com/ubuntu/ xenial universe
deb https://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb-src https://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb https://mirrors.aliyun.com/ubuntu/ xenial-security main
deb-src https://mirrors.aliyun.com/ubuntu/ xenial-security main
deb https://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb-src https://mirrors.aliyun.com/ubuntu/ xenial-security universe
*提示：或许你还不清楚自己unbuntu的版本号，看这里：
root@alan-ubuntu:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.7 LTS
Release: 16.04
Codename: xenial
二，备份源文件
虽然这一步显得很多余，将来可能永远不会使用旧的国外服务器源文件，但养成有改必备的习惯，或许真能救你与水火之中。
root@alan-ubuntu:~# cp /etc/apt/sources.list /etc/apt/sources.list.bak三，修改源文件
vim编辑粘贴保存即可，这样就变成了阿里云的镜像源。
root@alan-ubuntu:~# vim /etc/apt/sources.list
四，更新软件包索引
执行apt update命令即可：
root@alan-ubuntu:~# apt update
获取:1 https://mirrors.aliyun.com/ubuntu xenial InRelease [247 kB]
获取:2 https://mirrors.aliyun.com/ubuntu xenial-updates InRelease [99.8 kB]
获取:3 https://mirrors.aliyun.com/ubuntu xenial-security InRelease [99.8 kB]
获取:4 https://mirrors.aliyun.com/ubuntu xenial/main Sources [868 kB]
获取:5 https://mirrors.aliyun.com/ubuntu xenial/universe Sources [7,728 kB]
获取:6 https://mirrors.aliyun.com/ubuntu xenial/main amd64 Packages [1,201 kB]
获取:7 https://mirrors.aliyun.com/ubuntu xenial/main i386 Packages [1,196 kB]
获取:8 https://mirrors.aliyun.com/ubuntu xenial/main Translation-zh_CN [74.8 kB]
获取:9 https://mirrors.aliyun.com/ubuntu xenial/main Translation-en [568 kB]
获取:10 https://mirrors.aliyun.com/ubuntu xenial/main amd64 DEP-11 Metadata [733 kB]
获取:11 https://mirrors.aliyun.com/ubuntu xenial/main DEP-11 64x64 Icons [409 kB]
获取:12 https://mirrors.aliyun.com/ubuntu xenial/universe amd64 Packages [7,532 kB]
获取:13 https://mirrors.aliyun.com/ubuntu xenial/universe i386 Packages [7,512 kB]
获取:14 https://mirrors.aliyun.com/ubuntu xenial/universe Translation-zh_CN [172 kB]
获取:15 https://mirrors.aliyun.com/ubuntu xenial/universe Translation-en [4,354 kB]
获取:16 https://mirrors.aliyun.com/ubuntu xenial/universe amd64 DEP-11 Metadata [3,410 kB]
获取:17 https://mirrors.aliyun.com/ubuntu xenial/universe DEP-11 64x64 Icons [7,448 kB]
获取:18 https://mirrors.aliyun.com/ubuntu xenial-updates/main Sources [537 kB]
获取:19 https://mirrors.aliyun.com/ubuntu xenial-updates/universe Sources [445 kB]
获取:20 https://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 Packages [2,049 kB]
获取:21 https://mirrors.aliyun.com/ubuntu xenial-updates/main i386 Packages [1,525 kB]
获取:22 https://mirrors.aliyun.com/ubuntu xenial-updates/main Translation-en [461 kB]
获取:23 https://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [327 kB]
获取:24 https://mirrors.aliyun.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [252 kB]
获取:25 https://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 Packages [1,220 kB]
获取:26 https://mirrors.aliyun.com/ubuntu xenial-updates/universe i386 Packages [1,086 kB]
获取:27 https://mirrors.aliyun.com/ubuntu xenial-updates/universe Translation-en [358 kB]
获取:28 https://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [281 kB]
获取:29 https://mirrors.aliyun.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [437 kB]
获取:30 https://mirrors.aliyun.com/ubuntu xenial-security/main Sources [251 kB]
获取:31 https://mirrors.aliyun.com/ubuntu xenial-security/universe Sources [211 kB]
获取:32 https://mirrors.aliyun.com/ubuntu xenial-security/main amd64 Packages [1,648 kB]
获取:33 https://mirrors.aliyun.com/ubuntu xenial-security/main i386 Packages [1,159 kB]
获取:34 https://mirrors.aliyun.com/ubuntu xenial-security/main Translation-en [360 kB]
获取:35 https://mirrors.aliyun.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [93.7 kB]
获取:36 https://mirrors.aliyun.com/ubuntu xenial-security/main DEP-11 64x64 Icons [111 kB]
获取:37 https://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 Packages [785 kB]
获取:38 https://mirrors.aliyun.com/ubuntu xenial-security/universe i386 Packages [665 kB]
获取:39 https://mirrors.aliyun.com/ubuntu xenial-security/universe Translation-en [225 kB]
获取:40 https://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [130 kB]
获取:41 https://mirrors.aliyun.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [206 kB]
已下载 58.5 MB，耗时 1分 6秒 (875 kB/s)
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
有 188 个软件包可以升级。请执行 ‘apt list --upgradable’ 来查看它们。