Ubuntu18.04 替换软件源

要替换Ubuntu18.04的软件源，你可以按照以下步骤进行操作：

1. 打开终端，输入以下命令以备份原来的软件源文件：

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

2. 打开软件源配置文件，输入以下命令：

   sudo gedit /etc/apt/sources.list

3. 在打开的文件中，将所有内容替换为阿里源的配置。你可以使用以下配置：

   deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

4. 保存文件并关闭编辑器。

5. 最后，输入以下命令以更新软件源：

   sudo apt-get update

这样，你就成功替换了Ubuntu18.04的软件源为阿里源。请注意，这个过程可能需要一些时间来完成。
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