采用修改这个文件/etc/network/interfaces ，改ip的方式在ubuntu 18里行不通：
临时配置IP方法如下：
sudo ip addr add 192.168.87.145/24 dev enp125s0f0
ip link set dev enp125s0f0 up; ip link set dev enp125s0f0 down
To verify the IP address configuration of enp125s0f0, you can use the ip command in the following manner.
ip address show dev enp125s0f0
上面的方面是临时生效，要想让这个配置长期生效，需要修改如下的配置文件：
infokist-arm:~$ cat /etc/netplan/99_config.yaml network: version: 2 renderer: networkd ethernets: enp125s0f0: addresses: - 192.168.87.145/24 gateway4: 192.168.87.1 nameservers: search: [mydomain, otherdomain] addresses: [192.168.88.10,223.5.5.5] enp130s0f0: addresses: - 10.168.85.145/24 scutech@infokist-arm:~$
注意这个配置文件的缩进格式。
The configuration can then be applied using the netplan command. sudo netplan apply
