ubuntu 18.04换源

你可以通过以下步骤来更换Ubuntu 18.04的源：

1. 备份源列表文件：打开终端，输入以下命令备份源列表文件。

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

2. 打开源列表文件并修改：使用文本编辑器打开源列表文件。

sudo nano /etc/apt/sources.list

3. 在源列表文件中注释掉原有的源，并添加新的源。你可以选择使用国内的源，例如清华大学的源（即TUNA源）。在源列表文件中添加以下内容：

# 清华大学源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

4. 保存更改并退出文本编辑器。

5. 更新源列表和软件包信息。在终端中运行以下命令来更新源列表和软件包信息。

sudo apt update

现在，你的Ubuntu 18.04系统应该已成功更换为新的源。这样可以提高终端下载速度。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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