Não é possível usar Wifi para Inspiron 1420 no Ubuntu 14.04.3 LTS - Pedido de ajuda [duplicado]

Question

Eu sou novo no Ubuntu e Linux, embora eu tenha tido alguma experiência com computadores em outras plataformas há alguns anos. Recentemente, limpei o Windows Vista de um antigo laptop Dell Inspiron que não uso mais e instalei o Ubuntu 14.04.3 Desktop (32 bits) nele. Se eu puder fazer isso funcionar tranquilamente, também pretendo converter meu laptop de trabalho diário. O problema é que o Ubuntu 14.04.3 LTS não está reconhecendo o meu wireless (é um Broadcom 1390 que veio com o antigo Dell.) Eu tenho visto várias outras perguntas postadas sobre isso e tentei as soluções sugeridas em cerca de 10 delas, mas nenhuma tem trabalhou (alguns dos comandos do terminal retornam erros para links desatualizados, software não está mais presente na minha versão, etc.)
Alguns dos links fizeram referência a um script para coletar informações de rede no sistema para que outros possam me aconselhar como localizar e instalar os drivers de dispositivo corretos para minha placa sem fio mini-PCI. (Por favor, note que eu estou postando isso com o laptop antigo com um cabo Ethernet direto para o meu roteador. Em breve vou precisar mudar para wifi, portanto, este pedido). Vou copiar o conteúdo do wireless-info.txt aqui: *

########## wireless info START ##########

Report from: 26 Sep 2015 16:46 PDT -0700

Booted last: 26 Sep 2015 15:47 PDT -0700

Script from: 14 Jul 2015 17:04 UTC +0000

##### release ###########################

Distributor ID: Ubuntu
Description:    Ubuntu 14.04.3 LTS
Release:    14.04
Codename:   trusty

##### kernel ############################

Linux 3.19.0-28-generic #30~14.04.1-Ubuntu SMP Tue Sep 1 09:33:32 UTC 2015 i686 i686 i686 GNU/Linux

Parameters: ro, quiet, splash, vt.handoff=7

##### desktop ###########################

Ubuntu

##### lspci #############################

09:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express [14e4:1713] (rev 02)
    Subsystem: Dell Inspiron 1420 [1028:01f3]
    Kernel driver in use: tg3

0c:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01)
    Subsystem: Dell Wireless 1390 WLAN Mini-Card [1028:0007]
    Kernel driver in use: wl

##### lsusb #############################

Bus 002 Device 002: ID 05a9:2640 OmniVision Technologies, Inc. OV2640 Webcam
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

##### PCMCIA card info ##################

##### rfkill ############################

##### lsmod #############################

dell_wmi               16384  0 
sparse_keymap          16384  1 dell_wmi
dell_laptop            16384  0 
dcdbas                 16384  1 dell_laptop
wl                   6148096  1 
cfg80211              450560  1 wl
wmi                    20480  1 dell_wmi

##### interfaces ########################

auto lo
iface lo inet loopback

##### ifconfig ##########################

eth0      Link encap:Ethernet  HWaddr <MAC 'eth0' [IF]>  
          inet addr:192.168.1.117  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::<IP6 'eth0' [IF]>/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:29320 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18707 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:35350100 (35.3 MB)  TX bytes:2063099 (2.0 MB)
          Interrupt:17 

##### iwconfig ##########################

lo        no wireless extensions.

eth0      no wireless extensions.

##### route #############################

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     1      0        0 eth0

##### resolv.conf #######################

nameserver 127.0.1.1

##### network managers ##################

Installed:

    NetworkManager

Running:

root       748     1  0 15:46 ?        00:00:00 NetworkManager

##### NetworkManager info ###############

NetworkManager Tool

State: connected (global)

- Device: eth0  [Wired connection 1] -------------------------------------------
  Type:              Wired
  Driver:            tg3
  State:             connected
  Default:           yes
  HW Address:        <MAC 'eth0' [IF]>

  Capabilities:
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Properties
    Carrier:         on

  IPv4 Settings:
    Address:         192.168.1.117
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.1.1

    DNS:             192.168.0.1
    DNS:             192.168.1.1

##### NetworkManager.state ##############

[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true

##### NetworkManager.conf ###############

[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false

##### NetworkManager profiles ###########

[[/etc/NetworkManager/system-connections/Wi-Fi connection 1]] (600 root)
[connection] id=Wi-Fi connection 1 | type=802-11-wireless
[802-11-wireless] ssid=Beldin76
[ipv4] method=auto
[ipv6] method=auto

##### iw reg get ########################

Region: America/Los_Angeles (based on set time zone)

country 00:
    (2402 - 2472 @ 40), (3, 20)
    (2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
    (2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
    (5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
    (5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS

##### iwlist channels ###################

lo        no frequency information.

eth0      no frequency information.

##### iwlist scan #######################

lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

##### module infos ######################

modinfo: ERROR: Module wl not found.
[wl]

[cfg80211]
filename:       /lib/modules/3.19.0-28-generic/kernel/net/wireless/cfg80211.ko
description:    wireless configuration support
license:        GPL
author:         Johannes Berg
srcversion:     F28307769349A31F4B24FC2
depends:        
intree:         Y
vermagic:       3.19.0-28-generic SMP mod_unload modversions 686 
signer:         Magrathea: Glacier signing key
sig_key:        33:8B:B9:17:DF:9C:4F:70:3C:FC:37:87:18:3A:7E:6D:F3:BA:BD:3E
sig_hashalgo:   sha512
parm:           ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm:           cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)

##### module parameters #################

[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00

##### /etc/modules ######################

lp

##### modprobe options ##################

[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci

[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac

[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off

[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211

[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en

##### rc.local ##########################

exit 0

##### pm-utils ##########################

##### udev rules ########################

[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x14e4:0x1713 (tg3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

##### dmesg #############################

[   16.679573]  [<f9bcd7f1>] wl_pci_probe+0x371/0x730 [wl]
[   16.680005]  [<f8b1c073>] wl_module_init+0x73/0x1000 [wl]
[   16.680005] EIP: [<f9bd52a1>] wdev_priv.part.9+0x3/0x5 [wl] SS:ESP 0068:f47a9bac

########## wireless info END ############

*

    

Answer 1

Após uma pesquisa adicional, eu encontrei uma solução que funcionou para mim derivada da resposta mais popular (por Luis Alvarado) para esta questão em instalando drivers sem fio da Broadcom .

Especificamente, eu fiz uma nova instalação do Ubuntu 14.04.3 Desktop para desfazer quaisquer erros em minhas tentativas anteriores sem sucesso de fazer meu trabalho sem fio funcionar. Em seguida, executei o seguinte código no terminal, conforme recomendado na Etapa 1:

lspci -nn -d 14e4:  

Isso me disse que o PCI ID da minha placa wireless era [14e4: 4311] (rev 01) . Examinando a tabela sem fio da Broadcom na etapa 3, vi que precisaria de firmware-b43-installer . Então no terminal, eu corri:

sudo apt-get update  

seguido por:

sudo update-pciids

como recomendado na Etapa 2. Descobri por tentativa e erro que eu tinha que executar o seguinte no terminal:

sudo apt-get purge bcmwl-kernel-source  

como sugerido no final do Passo 1, embora eu não tenha instalado manualmente o pacote bcmwl-kernel-source .
Eu então corri o seguinte no terminal da Etapa 3:

sudo apt-get install firmware-b43-installer  

e depois desligue o computador e desconecte o cabo Ethernet do laptop. Depois de ligar o laptop e fazer o login no Ubuntu, o menu de rede detectou redes sem fio e eu consegui selecionar o meu próprio e fazer login nele com sucesso.