Ubuntu添加阿里云镜像

使用阿里或者其他国内镜像源包含了一些自带源没有的软件包，在速度上也相对快一些

1. 使用vim或者gedit命令编辑/etc/apt/sources.list文件

#使用vim编辑
$sudo vim /etc/apt/sources.list
#使用gedit编辑
$sudo gedit /etc/apt/sources.list

2. 在文档开始位置输入以下代码

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb 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 main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

编辑sources.list

3. 保存退出

4. 使用命令更新缓存

$sudo apt-get update
$sudo apt-get upgrade