1.查看本机IP、网卡信息

ifconfig

1.修改配置文件
sudo vi /etc/netplan/*.yaml

# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    Ethernet:  #配置的网卡名称
      dhcp4: no    #dhcp4关闭
      dhcp6: no    #dhcp6关闭
      addresses: [192.168.0.141/24]   #设置本机IP及掩码
      optional: true
      gateway4: 192.168.0.1   #设置网关
      nameservers:
          addresses: [192.168.0.1]   #设置DNS

设置后重启网卡：netplan apply / sudo netplan apply，然后查看ifconfig，修改成功

如果提示gateway4失效，则换用下面的配置文件。

network:
  version: 2
  renderer: networkd
  ethernets:
    Ethernet:
      dhcp4: no
      dhcp6: no
      addresses:
        - 192.168.0.141/24
      routes:
         - to: default
           via: 192.168.0.1
      nameservers:
          addresses:
             - 192.168.0.1