Ubuntu 永久修改 DNS
修改 systemd-resolved 配置
sudo nano /etc/systemd/resolved.conf
取消注释并修改以下行：
Copy
[Resolve]
DNS=1.1.1.1 223.5.5.5 # 指定 DNS 服务器（多个用空格分隔）。
Domains=~. # 表示所有域名查询都使用这些 DNS。
重启 systemd-resolved
sudo systemctl restart systemd-resolved
验证 DNS
resolvectl status
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