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- 打开终端，输入以下命令打开resolv.conf文件：
sudo nano /etc/resolv.conf - 在打开的文件中，可以编辑nameserver行添加DNS服务器的IP地址，例如：
nameserver 8.8.8.8 nameserver 8.8.4.4 按下Ctrl + O保存文件，然后按下Ctrl + X退出编辑器。
如果想要禁止系统更新resolv.conf文件，可以编辑/etc/resolv.conf.head文件，输入以下内容：
# This file is managed by man:systemd-resolved(8). Do not edit. # # This is a dynamic resolv.conf file for connecting local clients to the # internal DNS stub resolver of systemd-resolved. This file lists all # configured search domains. # # Run "systemd-resolve --status" to see details about the uplink DNS servers # currently in use. # # Third party programs should typically not access this file directly, but # only through the symlink at /etc/resolv.conf. To manage resolv.conf(5) # in a different way, replace this symlink by a static file or a different # symlink. # # See systemd-resolved.service(8) for details about the supported modes of # operation for /etc/resolv.conf. nameserver 127.0.0.53 按下Ctrl + O保存文件，然后按下Ctrl + X退出编辑器。
重启网络服务以使更改生效：
sudo systemctl restart systemd-resolved.service 