無線網絡卡的一種配置方法，通過wpa_supplicant並依據SSID及口令生成相關配置檔案，然後講配置檔案掛接進網絡卡的的配置即可（樹莓派中也使用這種方法）。當然也可以直接在interface無線網絡卡中配置明文的相關配置，條條大路通羅馬而已。

[email protected]:~$ 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

ubuntu-server16.0本身沒有自帶wpa_supplicant，所以一開始必須練有線網路安裝

apt-get install wpasupplicant

把WiFi-ssid和密碼寫入一個配置檔案

wpa_passphrase ssid password > xxx.conf

編輯網路配置檔案vi /etc/network/interfaces

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback
auto wlp5s0
iface wlp5s0 inet dhcp
wpa-conf /home/ubuntu/xxx.conf
# The primary network interface

生成無線網絡卡的配置檔案需要用到一下的方法，當然了wpa_supplicant是需要單獨安裝的。

wpa_supplicant  -i wlp5s0  -c /home/ubuntu/xxx.conf