Ubuntu24固定网卡IP

enp4s0：换成你自己的网卡名

addresses：固定的网卡IP

routes：路由器网关

cat /etc/netplan/01-network-manager-all.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp4s0:
      dhcp4: false
      addresses:
        - 192.168.1.2/24
      routes:
        - to: default
          via: 192.168.1.1
      nameservers:
        addresses:
          - 114.114.114.114

测试配置，会等待 120 秒，如果你还能连上服务器，回车确认；断网不动，自动回滚旧配置

sudo netplan try

确认没问题再正式应用

sudo netplan apply