frieder@friedersrechner:~$ sudo modprobe -rfv iwlwifi 
[sudo] password for frieder: 
frieder@friedersrechner:~$ sudo modprobe iwlwifi 
frieder@friedersrechner:~$ dmesg | egrep 'iwl|wlan|Firm' 
frieder@friedersrechner:~$ ifconfig -a 
eth0      Link encap:Ethernet  HWaddr 00:03:0d:97:54:01  
          inet addr:192.168.1.92  Bcast:192.168.1.255  Mask:255.255.255.0 
          inet6 addr: fe80::203:dff:fe97:5401/64 Scope:Link 
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
          RX packets:52136 errors:221 dropped:0 overruns:0 frame:221 
          TX packets:38847 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:72159431 (72.1 MB)  TX bytes:4326778 (4.3 MB) 
          Interrupt:19 Base address:0xdead 

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:784 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:784 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:0 
          RX bytes:75785 (75.7 KB)  TX bytes:75785 (75.7 KB) 

frieder@friedersrechner:~$ iwconfig 
lo        no wireless extensions. 

eth0      no wireless extensions. 

frieder@friedersrechner:~$ rfkill list 
frieder@friedersrechner:~$ lscpu | grep mode 
CPU op-mode(s):        32-bit, 64-bit 
frieder@friedersrechner:~$ free 
             total       used       free     shared    buffers     cached 
Mem:       1929500     947440     982060          0      39172     533300 
-/+ buffers/cache:     374968    1554532 
Swap:      3998716        948    3997768