1. 打開終端，輸入以下命令打開resolv.conf文件：

sudo nano /etc/resolv.conf

2. 在打開的文件中，可以編輯nameserver行添加DNS服務器的IP地址，例如：

nameserver 8.8.8.8
nameserver 8.8.4.4

3. 按下Ctrl + O保存文件，然后按下Ctrl + X退出編輯器。

4. 如果想要禁止系統更新resolv.conf文件，可以編輯/etc/resolv.conf.head文件，輸入以下內容：

# 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

5. 按下Ctrl + O保存文件，然后按下Ctrl + X退出編輯器。

6. 重啟網絡服務以使更改生效：

sudo systemctl restart systemd-resolved.service