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I just partitioned my hard drive and installed Ubuntu 12.04, but it is not detecting any wireless signal. When I was trying Ubuntu in Wubi, everything worked though.

Here is the output from ifconfig:

eth0      Link encap:Ethernet  HWaddr 2c:41:38:5a:b4:22  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          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)

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:65536  Metric:1
          RX packets:128 errors:0 dropped:0 overruns:0 frame:0
          TX packets:128 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:10208 (10.2 KB)  TX bytes:10208 (10.2 KB)
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There is no wireless adaptor listed in your output, so it doesn't work. Can you give the output of sudo lshw -C network This will reveal which network adaptors are plugged in your system. When we know that, further investigation is possible EDIT You can find a very good trouble shooting guide on askubuntu.com/questions/235279/… –  koenr Oct 12 '13 at 12:23
    
I think that more than that we need the output of sudo lspci -nnk | grep -A7 Network, iwconfig and nm-tool, –  Braiam Oct 13 '13 at 1:19

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