Ubuntu从18.04开始有了大的版本改动，网络配置有些不一样。

找到网路配置修改的yaml:

cd /etc/netplan
boonya@boonya-VirtualBox:/etc/netplan$ ls
01-network-manager-all.yaml
boonya@boonya-VirtualBox:/etc/netplan$ sudo vi 01-network-manager-all.yaml 

添加静态IP：

# Let NetworkManager manage all devices on this system

network:
  ethernets:
    enp0s3:
          dhcp4: no
          addresses: [192.168.0.10/24]
          gateway4: 192.168.0.1
          nameservers:
              addresses: [192.168.0.1,61.139.2.69]
  version: 2
  renderer: NetworkManager

使网路配置生效：

sudo netplan apply

本人博客园地址：Ubuntu20.04设置静态IP - boonya - 博客园