如果端口 53 正在使用中，则安装失败。在某些作系统的默认安装中，可能会出现此问题，其中systemd-resolved（DNS 服务器） 正在运行。

要防止出现此问题，请在安装前更改系统配置以使此端口可用。

1. 编辑/etc/systemd/resolved.conf:

   sudo vi /etc/systemd/resolved.conf
   

2. Add DNSStubListener=no as the last line in the file and save the file.

3. Rename the current /etc/resolv.conf file:

   sudo mv /etc/resolv.conf /etc/resolv.conf.orig
   

4. Create a symbolic link for /etc/resolv.conf:

   sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
   

   Note:

   You might encounter a temporary name resolution error (sudo: unable to resolve host {hostname}: Temporary failure in name resolution), which should be fixed when you restart systemd-resolved in the next step.

5. Restart the DNS service:

   sudo service systemd-resolved restart