Ubuntu更换软件源

国内访问Ubuntu的服务器的速度基本随缘，有时候奇慢无比。一般来说服务器端访问速度是没有问题的，奈何本地也需要使用，如：Ubuntu的PC端，win10的Linux子系统。本地使用，如果还是使用Ubuntu的官方源的话，速度真心感人，这时候就需要修改软件源了。就个人的使用感受来说，阿里巴巴开源镜像站提供的镜像还是很靠谱的，速度基本可以维持在1M/s的水平。

Ubuntu的软件源位于/etc/apt/sources.list，自定义软件源的时候，可以将其存放在/etc/apt/sources.list.d文件夹下。

目前在用的win10的Linux子系统使用的是1804版本的Ubuntu，而阿里巴巴开源镜像站官方正好有这版本的软件源配置说明😂，参见：ubuntu镜像-ubuntu下载地址-ubuntu安装教程-阿里巴巴开源镜像站

~~创建自己的配置文件，比如创建aliyun.list~~
~~bash sudo vi /etc/apt/sources.list.d/aliyun.list~~

~~编辑内容如下:~~
~~bash deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse~~
~~然后执行:~~
~~bash sudo apt-get update~~
~~即可。~~

现在使用Ubuntu 2004，做如下操作：
备份原来的源文件：

cp sources.list sources.list.bak

然后修改源文件，打开/etc/apt/sources.list，粘贴如阿里的源：

vi /etc/apt/sources.list

粘贴后保存退出：

deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

接着更新源，开始使用：

apt update