Ubuntu系统中，软件源文件地址为：/etc/apt/sources.list
1.备份原来的源，将以前的源备份一下，以防以后可以用的。
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2.打开/etc/apt/sources.list文件，在前面添加自己ubuntu版本的源，并保存。
①找出自己系统版本的阿里云源
lsb_release -a
将下面的文本中的DH换成你们自己版本的Codename,例如我的是jammy(可以用VScode全部替换)
deb http://mirrors.aliyun.com/ubuntu/ DH main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ DH main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ DH-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ DH-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ DH-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ DH-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ DH-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ DH-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ DH-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ DH-backports main restricted universe multiverse
sudo vim /etc/apt/sources.list（可将vim更换为自己熟悉的编辑器）
3.更新源和软件
sudo apt-get update sudo apt-get upgrade
