la conexión inalámbrica no funciona 14.04.3 LTS

la conexión inalámbrica no funciona 14.04.3 LTS

Amigos, hace dos días que estoy trabajando, intento hacer algo desde foros nacionales y extranjeros, pero no lo hice. Te agradecería si pudieras ayudar.

a) Instalé actualizaciones.

b) se puede conectar al cable

c) Instalé Windows 7, funcionando de forma inalámbrica como se ingresó en Windows

d) La tecla fn + f3 para abrir llave inalámbrica que no funciona, no se enciende cuando llega la señal inalámbrica de ubuntu.

Apagar la pantalla de la computadora muestra:

                                ubuntu 14.04
                                                ..... reboot: system halted
*stopping rsync daemon rsync                                        [OK]
*speech-dispatcher disabled ; edit/etc/default/speech-dispatcher
*asking all remaining processes to terminate...                     [OK]
all processes ended within 1 seconds...                             [OK]   
modemManager[640]: <info> Caught signal, shutting down...
modemManager[640]: <info> modemManager is shutting down

salida lspci:

00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05)
00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 420M] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GF108 High Definition Audio Controller (rev a1)
02:00.0 Ethernet controller: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe (rev 01)
03:00.0 Network controller: Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
ff:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 02)
ff:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 02)
ff:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
ff:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 02)
ff:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
ff:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02)

lspci-knn | grep Neto -A2; lista de rfkill

02:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe [14e4:1692] (rev 01)
    Subsystem: Acer Incorporated [ALI] Device [1025:036d]
    Kernel driver in use: tg3
03:00.0 Network controller [0280]: Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express) [168c:002e] (rev 01)
    Subsystem: Lite-On Communications Inc Device [11ad:6603]
    Kernel driver in use: ath9k
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes

iwconfig

wlan0     IEEE 802.11bgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=off   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

lo        no wireless extensions.

eth0      no wireless extensions.

escaneo de lista iwlist

wlan0     Failed to read scan data : Network is down

lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

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