查看网卡驱动：
lspci或lshw -c network
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一般人的都是eth0，和wlan0，但在Ubuntu Server 16.04里面变成了enp4s0和wlp5s0，算是第一个坑吧
ubuntu@ubuntu:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
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: enp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 28:d2:44:98:33:2a brd ff:ff:ff:ff:ff:ff
3: wlp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 18:cf:5e:00:84:ba brd ff:ff:ff:ff:ff:ff
inet 192.168.224.102/24 brd 192.168.224.255 scope global wlp5s0
valid_lft forever preferred_lft forever
inet6 fe80::1acf:5eff:fe00:84ba/64 scope link
valid_lft forever preferred_lft forever
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如果想要变回eth0也是可以的，参考以下步骤（没测试过）：
sudo vi /etc/default/grub
找到GRUB_CMDLINE_LINUX=””
改为GRUB_CMDLINE_LINUX=”net.ifnames=0 biosdevname=0”
然后
sudo grub-mkconfig -o /boot/grub/grub.cfg
重启后，网卡名称变成eth0和wlan0。参考：
https://www.cnblogs.com/EasonJim/p/7122834.html
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ubuntu-server16.0本身没有自带wpa_supplicant，所以一开始必须练有线网络安装
apt-get install wpasupplicant
把WiFi-ssid和密码写入一个配置文件
wpa_passphrase ssid password > xxx.conf
追加密码到配置文件中：
wpa_passphrase ssid password >> xxx.conf
编辑网络配置文件vi /etc/network/interfaces
注意：eth0和wlan0不要使用同一个网段，除非都插上网线了
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参考：
https://www.linuxidc.com/Linux/2016-05/131486.htm
http://www.luyixian.cn/news_show_18554.aspx