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修改 /etc/apt/sources.list 文件，也即修改镜像源，能够加快在 Ubuntu 中下载和更新相关软件数据；否则默认情况下使用的是外网，下载起来比较慢！！！
基本步骤：
1、复制一份 /etc/apt/sources.list 文件，以作备用,其中 sources-bak.list 是备份文件名；
sudo cp /etc/apt/sources.list /etc/apt/sources-bak.list
2、打开 /etc/apt/sources.list 文件；
sudo vi /etc/apt/sources.list
3、点击 D 删除里面的所有内容；
4、打开镜像源 阿里云镜像源链接 ；
5、找到 Ubuntu 对应版本的镜像；
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
6、将其内容复制到 /etc/apt/sources.list 文件下；
7、点击 ESC 然后输入“：wq”，保存并退出；
8、更新镜像源；
sudo apt update
sudo apt upgrade
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