After Raspberry Pi 3B installed ubuntu server open wifi

Raspberry Pi's official website to download the image to select ubuntu server

step 1：

　　Use SDFormatter format the SD card;

step2：

　　Use win32diskimager tool to write the image to the prepared SD card;

step3：

　　Insert the keyboard and the HDMI cable linking the TV power, power-on, the login screen appears enter a username and password ubuntu, reset the password.

step4：

　　Because ubuntu server iwconfig tool is not installed, you need to find a network cable network link, install wireless-tools:

　　sudo apt install wireless-tools

After installation wireless-tools, can be used in the following step iwconfig wireless network set up:

1, first set open wireless network card and set the SSID

1 sudo iwconfig wlan0 power on
2 sudo ifconfig wlan0 up
3 sudo iwconfig wlan0 essid "无线名称"

2, and then use the key to generate a radio wpa_passphrase

. 1  the sudo - I 
 2 wpa_passphrase wireless Password> /etc/wpa_supplicant.conf

3, then edit /etc/wpa_supplicant.conf

1  sudo  vi the /etc/wpa_supplicant.conf 
　　

ensure the document reads as follows:

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
ap_scan=1
network={
        ssid="OpenWrt_2.4G_4680A1"
        proto=RSN
        key_mgmt=WPA-PSK
        pairwise=CCMP TKIP
        group=CCMP TKIP
        psk=0192c3b3469fcf872387c0e069fee5731ce7f8782654e1a5caa0c165700e76c8
}

! ! ! Note that the configuration key points as follows:

= Network { 
        ssid = " my_network "    # ssid note names are case sensitive. 
        proto = RSN #Robust Security Network: robust security network, indicates that the network configuration to be more secure than WEP mode. 
        key_mgmt = WPA-PSK # Please Whether you use WPA-PSK, WPA2-PSK, will enter it here WPA-PSK. This appears to WPA-PSK, WPA2-PSK WPA- are in wpa_supplicant PSK 
        pairwise = CCMP TKIP # key point, wpa_supplicant is not yet recognized encryption standard AES of 
        Group = CCMP TKIP # ditto 
        PSK = 7b271c9a7c8a6ac07d12403a1f0792d7d92b5957ff8dfd56481ced43ec6a6515 #wpa_supplicant calculated encrypted password .

4, after the above setting is completed profile, then applied manually configure

1 sudo wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf
2 sudo dhclient wlan0

5, in order to boot automatically open wifi, need to be added to the startup script to automatically perform the service, first add the following script in /etc/rc.local:

ip link set wlan0 up &&
wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant.conf &&
dhclient wlan0

Edit /lib/systemd/system/rc-local.service then added as follows:

[Install]
WantedBy=multi-user.target
Alias=rc-local.service

This can be achieved automatically boot the wifi connection.

After Raspberry Pi 3B installed ubuntu server open wifi

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