No me conecta por wifi ubuntu 12.04

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Buenas, tengo ubuntu 12.04 en mi laptop y no me puedo conectar por wifi, oprimo el boton de wifi del teclado y no se prende, soy nuevo usando este sistema operativo, por lo cual agradeceria cualquier ayuda que se me brindara.

Gracias!

Imagen de jmyrrie
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joel@joel:~$ lspci
00:00.0 Host bridge: Advanced Micro Devices [AMD] nee ATI RS480 Host Bridge (rev 01)
00:01.0 PCI bridge: Advanced Micro Devices [AMD] nee ATI RS480 PCI Bridge
00:05.0 PCI bridge: Advanced Micro Devices [AMD] nee ATI RS480 PCI Bridge
00:13.0 USB controller: Advanced Micro Devices [AMD] nee ATI IXP SB400 USB Host Controller
00:13.1 USB controller: Advanced Micro Devices [AMD] nee ATI IXP SB400 USB Host Controller
00:13.2 USB controller: Advanced Micro Devices [AMD] nee ATI IXP SB400 USB2 Host Controller
00:14.0 SMBus: Advanced Micro Devices [AMD] nee ATI IXP SB400 SMBus Controller (rev 11)
00:14.1 IDE interface: Advanced Micro Devices [AMD] nee ATI IXP SB400 IDE Controller
00:14.3 ISA bridge: Advanced Micro Devices [AMD] nee ATI IXP SB400 PCI-ISA Bridge
00:14.4 PCI bridge: Advanced Micro Devices [AMD] nee ATI IXP SB400 PCI-PCI Bridge
00:14.5 Multimedia audio controller: Advanced Micro Devices [AMD] nee ATI IXP SB400 AC'97 Audio Controller (rev 02)
00:14.6 Modem: Advanced Micro Devices [AMD] nee ATI IXP SB400 AC'97 Modem Controller (rev 02)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Radeon XPRESS 200M 5955 (PCIE)
06:02.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
06:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)

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Imagen de cuentos
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mira aquí:
http://linuxman.blogsome.com/2011/04/29/problema-con-las-tarjetas-broadc...
Y según solo es de intalar el firmware, en la terminal ejecuta:
sudo apt-get install firmware-b43-installer
y te levanta la wifi.

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