Redes sem fio não funcionam [duplicado]

Question

Estou executando o Ubuntu 12.10 ao lado do Windows 7 Posso conectar-me à Internet usando ethernet, mas não consigo detectar nenhuma rede sem fio. Quando eu uso o Windows 7, posso me conectar bem. Qualquer ajuda seria muito apreciada. A saída para lspci -v | grep -iA 10 rede foi:

02:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
Subsystem: Dell Wireless 1704 802.11n + BT 4.0
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at c0500000 (64-bit, non-prefetchable) [size=32K]
Capabilities: <access denied>

lsmod:

Module                  Size  Used by
joydev                 17457  0 
snd_hda_codec_hdmi     32007  1 
snd_hda_codec_conexant    57842  1 
rfcomm                 46619  12 
bnep                   18140  2 
parport_pc             32688  0 
ppdev                  17073  0 
lp                     17759  0 
parport                46345  3 parport_pc,ppdev,lp
coretemp               13400  0 
kvm_intel             132759  0 
kvm                   414070  1 kvm_intel
ghash_clmulni_intel    13180  0 
cryptd                 20403  1 ghash_clmulni_intel
dell_wmi               12681  0 
sparse_keymap          13890  1 dell_wmi
psmouse                95552  0 
dell_laptop            17369  0 
dcdbas                 14438  1 dell_laptop
microcode              22803  0 
snd_hda_intel          33491  3 
snd_hda_codec         134212  3        snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
snd_hwdep              13602  1 snd_hda_codec
uvcvideo               76749  0 
videobuf2_core         32851  1 uvcvideo
videodev              120309  2 uvcvideo,videobuf2_core
videobuf2_vmalloc      12860  1 uvcvideo
videobuf2_memops       13368  1 videobuf2_vmalloc
snd_pcm                96580  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi           13324  0 
snd_rawmidi            30512  1 snd_seq_midi
wmi                    19070  1 dell_wmi
btusb                  18334  0 
bluetooth             209199  22 rfcomm,bnep,btusb
snd_seq_midi_event     14899  1 snd_seq_midi
mac_hid                13205  0 
snd_seq                61521  2 snd_seq_midi,snd_seq_midi_event
snd_timer              29425  2 snd_pcm,snd_seq
snd_seq_device         14497  3 snd_seq_midi,snd_rawmidi,snd_seq
rts5139               356158  0 
snd                    78734  16   snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,s    nd_rawmidi,snd_seq,snd_timer,snd_seq_device
i915                  520519  3 
drm_kms_helper         46784  1 i915
drm                   275528  4 i915,drm_kms_helper
i2c_algo_bit           13413  1 i915
soundcore              15047  1 snd
snd_page_alloc         18484  2 snd_hda_intel,snd_pcm
serio_raw              13215  0 
lpc_ich                17061  0 
mei                    40690  0 
video                  19335  1 i915
r8169                  61650  0 

iwconfig:

eth0      no wireless extensions.

lo        no wireless extensions.

rfkill listar todos

0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

    

Answer 1

Se não houver drivers sugeridos na guia "Drivers adicionais":

Antes de executar esta tarefa:

lspci -nn | grep -i network

e verifique se o número do dispositivo corresponde a esse Broadcom Corporation Device [14e4:4365]

Se for esse o caso

Faça o download do este dkms ativado bcm43142 driver de jas.gemnetworks.com e salve-o na sua pasta Download .

No termo executar:

sudo apt-get install linux-headers-generic build-essential dkms

em seguida, instale o pacote, ainda no termo:

cd ~/Download
sudo dpkg -i wire*.deb
sudo modprobe wl