一、

ip address

sudo nano /etc/netplan/50-cloud-init.yaml

修改前：

修改后：

====================================================================
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        enp0s3:
            dhcp4: no
            addresses: [192.168.31.142/24]
            optional: true
            routes:
              - to: default
                via: 192.168.31.1
            nameservers:
              addresses: [114.114.114.114,8.8.8.8]
    version: 2
====================================================================

sudo netplan apply #生效