Ubuntu18.04网络管理改成netplan方式 ，配置写在/etc/netplan/目录下，类型为xxx.yaml文件，我这里是：

01-network-manager-all.yaml

修改前先确认下自己的网卡名称，输入

ip addr

进行查看

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:2c:30:fa brd ff:ff:ff:ff:ff:ff
    inet 192.168.174.152/24 brd 192.168.174.255 scope global dynamic noprefixroute ens33
       valid_lft 1309sec preferred_lft 1309sec
    inet6 fe80::3a03:14e5:b956:9894/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

可以看出我这里就一个，名字叫ens33,接下来进行配置， 打开01-network-manager-all.yaml进修改：

添加

ethernets:
    ens33:
      addresses:
      - 192.168.250.5/24
      dhcp4: false
      gateway4: 192.168.250.1
      nameservers:
        addresses:
        - 192.168.250.1
        search: []

# Let NetworkManager manage all devices on this system
network:
  ethernets:
    ens33:                #网卡名称
      addresses:
      - 192.168.250.5/24  #固定IP地址和网段（子网掩码）或者addresses: [192.168.250.5/24]
      dhcp4: false        #关闭DHCP
      dhcp6: false        
      gateway4: 192.168.250.1#网关
      nameservers:
        addresses:
        - 192.168.250.1 #DNS
        search: []
  version: 2
  renderer: NetworkManager

测试一下：sudo netplan try

sudo netplan try 

生效更改：sudo netplan apply

sudo netplan apply

扩展：

恢复自动获取就把添加的给删了就可以了

重新启停以太网卡命令：

ifconfig ens33 down

ifconfig ens33 up

多网卡配置时，局域网的不要配网关，访问外网的配置正确网关