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sohrab@ubuntu:~$ iwconfig lo no wireless extensions. eth0 no wireless extensions. wmaster0 no wireless extensions. wlan0 IEEE 802.11bg ESSID:"" Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated Tx-Power=0 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 sohrab@ubuntu:~$ iwlist scan lo Interface doesn't support scanning. eth0 Interface doesn't support scanning. wmaster0 Interface doesn't support scanning. wlan0 Failed to read scan data : Network is down sohrab@ubuntu:~$ dmesg | grep Broadcom [ 15.059582] b43-phy0: Broadcom 4318 WLAN found (core revision 9) [ 15.322649] Broadcom 43xx driver loaded [ Features: PL, Firmware-ID: FW13 ] sohrab@ubuntu:~$ sohrab@ubuntu:~$ lsmod | grep b43 b43 122136 0 mac80211 181236 1 b43 cfg80211 93052 2 b43,mac80211 led_class 4096 1 b43 ssb 35300 1 b43 sohrab@ubuntu:~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: No such file or directory