注:配置/etc/network/interfaces已无用

root@ubuntu:~# vim /etc/netplan/50-cloud-init.yaml

network:
    ethernets:
        ens33:
            addresses: [192.168.1.108/24]
            dhcp4: true
            optional: true
    version: 2

执行命令 使配置生效

root@ubuntu:~# netplan apply