ubuntu 22.04切换阿里源

你可以按照以下步骤切换 Ubuntu 22.04 的软件源为阿里源：

1. 打开终端（快捷键为 `Ctrl + Alt + T`）。
2. 备份原有的软件源列表文件，以防意外情况发生：`sudo mv /etc/apt/sources.list /etc/apt/sources.list.backup`
3. 生成一个新的软件源列表文件：`sudo touch /etc/apt/sources.list`
4. 编辑软件源列表文件：`sudo nano /etc/apt/sources.list`
5. 将以下内容复制到文件中并保存：

# 阿里云镜像源
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-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

## Not recommended
# 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

6. 更新软件源：`sudo apt-get update`

现在你已经成功将 Ubuntu 22.04 的软件源切换为阿里源了。