修改 /etc/network/interfaces

sudo nano /etc/network/interfaces
auto lo
iface lo inet loopback

auto ens33
iface ens33 inet static
address 192.168.1.100
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 8.8.8.8 114.114.114.114

ctrl+o保存，回车，ctrl+c退出

然后重启网络：

sudo service networking restart

重启

sudo reboot