【嵌入式硬件Esp32】Ubuntu18.04 更换阿里云软件源

使用Ubuntu 的apt-get来安装软件是总是因为官方源的速度太慢而抓狂。
但是用阿里云的源就很快，下面总结一下如何更换Ubuntu的软件源。

一、备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
 
二、修改
sudo vim /etc/apt/sources.list
 
将source.list文件内容替换成下面的

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 multiverse
 
三、更新
sudo apt-get update