Ubuntu——使用阿里提供的下载源

https://blog.youkuaiyun.com/qq_33472557/article/details/77389192

备份文件

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak 

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打开文件

　使用vim打开文件

sudo vim /etc/apt/sources.list

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　如果没有安装vim，执行下面的命令，再去执行上面的命令

sudo apt-get install vim

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修改文件

　将文件中的全部内容替换为以下部分：

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

注意不同版本的ubuntu所使用的源也是不同的。参照以下网址的版本代号，替换文件中出现的“trusty”
　https://www.aliyun.com/jiaocheng/118875.html

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本文参考：https://blog.youkuaiyun.com/qq_33472557/article/details/77389192