1、将raspberry连接上路由器，通过以下命令查找路由器网段连接的设备
wiwa@tech:~$ sudo nmap -sP 192.168.31.0-254
Starting Nmap 7.01 ( https://nmap.org ) at 2016-11-22 20:48 CST
Nmap scan report for XiaoQiang (192.168.31.1)
Host is up (0.0046s latency).
MAC Address: 28:6C:07:32:01:60 (Unknown)
Nmap scan report for 192.168.31.16
Host is up (0.063s latency).
MAC Address: B8:27:EB:E4:A2:BC (Raspberry Pi Foundation)
Nmap scan report for 192.168.31.125
Host is up (-0.089s latency).
MAC Address: B8:27:EB:B1:F7:E9 (Raspberry Pi Foundation)
Nmap scan report for 192.168.31.240
Host is up.
Nmap done: 255 IP addresses (4 hosts up) scanned in 2.30 seconds
2、通过SSH登录Raspberry Pi （密码：raspberry）：
wiwa@tech:~$ ssh pi@192.168.31.16
pi@192.168.31.16's password:
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Tue Nov 22 12:01:37 2016 from 192.168.31.240
pi@raspberrypi:~ $
3、在Raspberry Pi端安装VNC server：
pi@raspberrypi:~ $ sudo apt-get install tightvncserver
4、开启Raspberry Pi VNC server端界面（首次开启需要设定密码）：
pi@raspberrypi:~ $ sudo vncserver :2 -geometry 800x600 -depth 24
5、在ubuntu端安装VNC viewer 客户端：
wiwa@tech:~$ sudo apt-get install xtightvncviewer
6、在ubuntu段登录查看Raspberry Pi的界面(输入Raspberry Pi的VNC服务器已设定的密码）:
wiwa@tech:~$ xtightvncviewer 192.168.31.125:2
Connected to RFB server, using protocol version 3.8
Enabling TightVNC protocol extensions
Performing standard VNC authentication
Password:
Authentication successful
Desktop name "pi's X desktop (raspberrypi:2)"
VNC server default format:
32 bits per pixel.
Least significant byte first in each pixel.
True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
Warning: Cannot convert string "-*-helvetica-bold-r-*-*-16-*-*-*-*-*-*-*" to type FontStruct
Using default colormap which is TrueColor. Pixel format:
32 bits per pixel.
Least significant byte first in each pixel.
True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
7、登录的界面截图
