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I have my cable plugged in but in the network configuration its says disconnected. Why is there something missing? ifconfig shows:

Link encap:Ethernet  HWaddr 20:cf:30:36:a0:4a  
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Can anybody help me please?

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It doesn't seem like Ubuntu is detecting anything plugged in at the other end of the Ethernet cable. Make sure that the other end of the cable to plugged in. –  Aaron Nov 2 '12 at 18:51
What do you see if you re–plug in the cable while running ip monitor? If there are lights on the ethernet port, what are they doing? (Feel free to edit your question to include more details as you uncover them.) –  ændrük Nov 2 '12 at 19:35
No there is no lights on the ethernet port and it doesnt appear nothing in the ip monitor when i re-plug the cable –  user104002 Nov 4 '12 at 11:06
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