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In a tutorial when we write something in all caps like IP_OF_LAPTOP, we mean that you should replace IP_OF_LAPTOP with your actual IP. You can find out the IP of a computer in Ubuntu by typing ifconfig in a terminal.

you should see something like:

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:88474362 errors:0 dropped:0 overruns:0 frame:0
          TX packets:88474362 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:9302480192 (9.3 GB)  TX bytes:9302480192 (9.3 GB)

wlan0     Link encap:Ethernet  HWaddr 48:5d:60:7d:22:e6  
          inet addr:192.168.1.4  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::4a5d:60ff:fe7d:22e6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1093031 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1422901 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:430045105 (430.0 MB)  TX bytes:1327311556 (1.3 GB)

In this example the IP_OF_LAPTOP is 192.168.1.4