如果遇到No wireless interfaces found，则编辑/etc/network/interfaces

auto wlan0
allow-hotplug wlan0
iface wlan0 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
#重启网络配置
$sudo /etc/init.d/networking restart
如果仍旧提示No wireless interfaces found，则执
$sudo dhcpcd
$sudo /etc/init.d/networking restart
或
$echo 'wifi_password' | sudo wpa_passphrase ssid&sudo dhcpcd wlan0

下面进入配置步骤：

1.sudo killall wpa_supplicant

2.sudo ip link set dev wlan0 up

3.sudo iwlist wlan0 scan

4.sudo vi /etc/wpa_supplicant/wpa_supplicant.conf

尾部添加

===============================================

network={

    ssid="你的wifi名称"

    psk="密码"      #如果wifi没有密码，这一行替换为key_mgmt=NONE

}

===============================================

或者

sudo wpa_passphrase ssid

# reading passphrase from stdin

输入密码

然后会自动更新/etc/wpa_supplicant/wpa_supplicant.conf

5.刷新配置

sudo rm /var/run/wpa_supplicant/wlan0 -f

sudo wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf

或

sudo wpa_supplicant -B -c /etc/wpa_supplicant/wpa_supplicant.conf -i wlan0 -Dwext

（某些硬件上nl80211驱动不支持）

sudo wpa_cli -i wlan0 reconfigure

---------------------

无线射频被锁起来了，使用sudo rfkill list查看是否关闭射频

需要打开：sudo rfkill unblock all

启动wifi脚本：

#!/bin/bash
echo 'ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev' > /etc/wpa_supplicant/wpa_supplicant.conf
echo 'update_config=1' >> /etc/wpa_supplicant/wpa_supplicant.conf
echo 'country=CN' >> /etc/wpa_supplicant/wpa_supplicant.conf
echo 'wifi_password' | sudo wpa_passphrase 'wifi_ssid' >> /etc/wpa_supplicant/wpa_supplicant.conf
sudo pkill dhcpcd
sudo ip link set wlan0 up
sudo dhcpcd wlan0

停止wifi脚本：

#!/bin/bash
sudo ip link set wlan0 down