备份 source.list 文件
```
cp /etc/apt/sources.list /etc/apt/sources.list.bak
```
```
vim /etc/apt/sources.list
```

复制粘贴
```
deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
```

更新
```
apt update
```

升级现有软件包（可选）
```
apt upgrade
```

修改 PPA 和第三方源（如果有的话）
```
/etc/apt/sources.list.d/
```

替换 ppa 文件的URL，一般将 ppa.launchpad.net 修改为 ppa.mirrors.aliyun.com
```
deb http://ppa.mirrors.aliyun.com/ppa/username/repositoryname/ jammy main
```