11.04无线网络被禁用，求解答！

代码:

loli@ubuntu:~$ ndiswrapper -l
rt2870 : driver installed
   device (148F:5370) present

代码:

loli@ubuntu:~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:off/any 
          Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

代码:

loli@ubuntu:~$ iwlist scan
lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

wlan0     Failed to read scan data : Network is down