ubuntu 更换下载源

要在Ubuntu系统中更换下载源，可以按照以下步骤进行操作：

1. 首先，备份原有的软件源文件。在终端中输入以下命令：
sudo cp /etc/apt/sources.list /etc/apt/sources.list.old [2]

2. 打开源文件进行编辑。在终端中输入以下命令：
sudo gedit /etc/apt/sources.list [2]

3. 在打开的文件中，将现有的下载源地址替换为所需的源地址。比如，如果要使用阿里云下载源，可以将以下内容添加到文件中：
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse [1]

4. 保存并关闭文件。

5. 更新软件源。在终端中输入以下命令：
sudo apt-get update [3]

通过以上步骤，你可以在Ubuntu系统中成功更换下载源，提高下载速度。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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