[NOTE]Ubuntu 20.04 aliyun

1.backup

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

2.replace

sudo vi /etc/apt/sources.list

[i]

[ESC]
:%s/url_string1/mirrors.aliyun.com/g

[ESC]
:%s/url_string2/mirrors.aliyun.com/g

[ESC]
:wq

3.update

sudo apt-get update
sudo apt-get upgrade