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Hi I'm new to ask ubuntu. Sorry for any format mistakes I would have made.

So as specified in title, I have just brought a usb wireless device WLI-UC-G3000HP-V1 from BUFFALO INC., and I have install the driver from instructions here:

http://www.cyberciti.biz/tips/linux-install-rt2870-chipset-based-usb-wireless-adapter.html

Now I'm fine with the driver, but the usb device do not scan any wifi network. By this I mean that in

* ifconfig ra0 *

ra0   Link encap:Ethernet  HWaddr 10:6f:3f:af:95:d5  
      inet6 addr: fe80::126f:3fff:feaf:95d5/64 Scope:Link
      UP BROADCAST MULTICAST  MTU:1500  Metric:1
      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
      TX packets:10614 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:0 (0.0 B)  TX bytes:3539056 (3.5 MB)

* iwconfig ra0 *

ra0   Ralink STA  ESSID:"Dennis2860AP"  Nickname:"RT2870STA"
      Mode:Auto  Frequency=2.412 GHz  Access Point: Not-Associated   
      Bit Rate:1 Mb/s   
      RTS thr:off   Fragment thr:off
      Link Quality=10/100  Signal level:0 dBm  Noise level:0 dBm
      Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
      Tx excessive retries:0  Invalid misc:0   Missed beacon:0

* sudo iwlist ra0 scan *

ra0       No scan results

* nm-tool *

- Device: ra0 ------------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            usb
  State:             disconnected
  Default:           no
  HW Address:        10:6F:3F:AF:95:D5

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points 

and the relevant syslog:

Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:14.0/usb3/3-2/net/ra0, iface: ra0)
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]:    SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:14.0/usb3/3-2/net/ra0, iface: ra0): no ifupdown configuration found.
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): driver does not support SSID scans (scan_capa 0x00).
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): using WEXT for WiFi device control
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <error> [1380991669.299773] [nm-device-wifi.c:2841] update_permanent_hw_address(): (ra0): unable to read permanent MAC address (error 0)
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): new 802.11 WiFi device (driver: 'usb' ifindex: 4)
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): exported as /org/freedesktop/NetworkManager/Devices/2
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): bringing up device.
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): preparing device.
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): deactivating device (reason 'managed') [2]
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): taking down device.
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <warn> (ra0): failed to change interface MAC address
Oct  6 00:47:49 user-LIFEBOOK-LH532 NetworkManager[981]: <warn> (ra0): failed to reset MAC address to 00:00:00:00:00:00
Oct  6 00:47:50 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): taking down device.
Oct  6 00:47:50 user-LIFEBOOK-LH532 NetworkManager[981]: <warn> (ra0): error 100 getting card mode
Oct  6 00:47:50 user-LIFEBOOK-LH532 NetworkManager[981]: <error> [1380991670.341047] [wifi-utils-wext.c:160] wifi_wext_set_mode(): (ra0): error setting mode 2
Oct  6 00:47:50 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): bringing up device.
Oct  6 00:47:51 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0) supports 1 scan SSIDs
Oct  6 00:47:51 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): supplicant interface state: starting -> ready
Oct  6 00:47:51 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
Oct  6 00:47:51 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): supplicant interface state: ready -> inactive
Oct  6 00:47:51 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0) supports 1 scan SSIDs
Oct  6 00:47:53 user-LIFEBOOK-LH532 avahi-daemon[946]: Joining mDNS multicast group on interface ra0.IPv6 with address fe80::126f:3fff:feaf:95d5.
Oct  6 00:47:53 user-LIFEBOOK-LH532 avahi-daemon[946]: New relevant interface ra0.IPv6 for mDNS.
Oct  6 00:47:53 user-LIFEBOOK-LH532 avahi-daemon[946]: Registering new address record for fe80::126f:3fff:feaf:95d5 on ra0.*.
Oct  6 00:54:30 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): device state change: disconnected -> unmanaged (reason 'removed') [30 10 36]
Oct  6 00:54:30 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): cleaning up...
Oct  6 00:54:30 user-LIFEBOOK-LH532 NetworkManager[981]: <info> (ra0): taking down device.
Oct  6 00:54:31 user-LIFEBOOK-LH532 avahi-daemon[946]: Interface ra0.IPv6 no longer relevant for mDNS.
Oct  6 00:54:31 user-LIFEBOOK-LH532 avahi-daemon[946]: Leaving mDNS multicast group on interface ra0.IPv6 with address fe80::126f:3fff:feaf:95d5.
Oct  6 00:54:31 user-LIFEBOOK-LH532 avahi-daemon[946]: Withdrawing address record for fe80::126f:3fff:feaf:95d5 on ra0.
Oct  6 00:54:31 user-LIFEBOOK-LH532 kernel: [ 1895.758809] IPv6: ADDRCONF(NETDEV_UP): ra0: link is not ready

I would appreciate any comment and assistance from you. Thank you very much!

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