Ubuntu20.04中使用netplan配置网络

在Ubuntu20.04中已经不使用/etc/networks/interface来配置网络了，而是使用netplan配置网络：

cat /etc/netplan/00-installer-config.yaml

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp1s0:
      dhcp4: true
      #addresses:
      #- 172.18.225.240/24
      #gateway4: 172.18.225.254
      nameservers:
        addresses:
        - 223.6.6.6
        - 223.5.5.5
        search: []
  version: 2