Eu instalei recentemente o Ubuntu14.04 no meu laptop e depois da instalação eu não vi nenhuma opção de Wifi chegando, então eu tentei abaixo das coisas
sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get install linux-firmware-nonfree
sudo modprobe b43
sudo su
echo "b43" >> /etc/modules
Como mencionado em este vídeo
e aqui a captura de tela do driver para Wifi
##########wirelessinfoSTART##########Reportfrom:09Nov201521:35IST+0530Bootedlast:09Nov201520:55IST+0530Scriptfrom:27Sep201500:34UTC+0000#####release###########################DistributorID:UbuntuDescription:Ubuntu14.04.3LTSRelease:14.04Codename:trusty#####kernel############################Linux3.19.0-32-generic#37~14.04.1-UbuntuSMPThuOct2209:41:40UTC2015x86_64x86_64x86_64GNU/LinuxParameters:ro,quiet,splash,vt.handoff=7#####desktop###########################Ubuntu#####lspci#############################01:00.0Ethernetcontroller[0200]:BroadcomCorporationNetLinkBCM57785GigabitEthernetPCIe[14e4:16b5](rev10)Subsystem:AcerIncorporated[ALI]Device[1025:0605]Kerneldriverinuse:tg302:00.0Networkcontroller[0280]:BroadcomCorporationBCM43227802.11b/g/n[14e4:4358]Subsystem:FoxconnInternational,Inc.Device[105b:e040]Kerneldriverinuse:bcma-pci-bridge#####lsusb#############################Bus003Device001:ID1d6b:0002LinuxFoundation2.0roothubBus006Device001:ID1d6b:0001LinuxFoundation1.1roothubBus002Device002:ID064e:d20cSuyinCorp.Bus002Device001:ID1d6b:0002LinuxFoundation2.0roothubBus005Device001:ID1d6b:0001LinuxFoundation1.1roothubBus001Device002:ID0bb4:0c02HTC(HighTechComputerCorp.)Dream/ADP1/G1/Magic/Tattoo(Debug)Bus001Device001:ID1d6b:0002LinuxFoundation2.0roothubBus004Device001:ID1d6b:0001LinuxFoundation1.1roothub#####PCMCIAcardinfo#######################rfkill############################0:acer-wireless:WirelessLANSoftblocked:noHardblocked:no#####lsmod#############################wl63692800acer_wmi204800sparse_keymap163841acer_wmib434218880bcma532481b43mac802117086081b43ssb655361b43cfg802115242883wl,b43,mac80211video204801acer_wmiwmi204801acer_wmi#####interfaces########################autoloifaceloinetloopback#####ifconfig##########################eth0Linkencap:EthernetHWaddr<MAC'eth0'[IF]>inetaddr:192.168.0.102Bcast:192.168.0.255Mask:255.255.255.0inet6addr:fe80::<IP6'eth0'[IF]>/64Scope:LinkUPBROADCASTRUNNINGMULTICASTMTU:1500Metric:1RXpackets:39300errors:0dropped:0overruns:0frame:0TXpackets:32116errors:0dropped:0overruns:0carrier:0collisions:0txqueuelen:1000RXbytes:37458781(37.4MB)TXbytes:4038182(4.0MB)Interrupt:16#####iwconfig##########################eth0nowirelessextensions.lonowirelessextensions.#####route#############################KernelIProutingtableDestinationGatewayGenmaskFlagsMetricRefUseIface0.0.0.0192.168.0.10.0.0.0UG000eth0192.168.0.00.0.0.0255.255.255.0U100eth0#####resolv.conf#######################nameserver127.0.1.1#####networkmanagers##################Installed:NetworkManagerRunning:root7841020:55?00:00:00NetworkManager#####NetworkManagerinfo###############NetworkManagerToolState:connected(global)-Device:eth0[Wiredconnection1]-------------------------------------------Type:WiredDriver:tg3State:connectedDefault:yesHWAddress:<MAC'eth0'[IF]>Capabilities:CarrierDetect:yesSpeed:100Mb/sWiredPropertiesCarrier:onIPv4Settings:Address:192.168.0.102Prefix:24(255.255.255.0)Gateway:192.168.0.1DNS:192.168.0.1#####NetworkManager.state##############[main]NetworkingEnabled=trueWirelessEnabled=trueWWANEnabled=trueWimaxEnabled=true#####NetworkManager.conf###############[main]plugins=ifupdown,keyfile,ofonodns=dnsmasq[ifupdown]managed=false#####NetworkManagerprofiles###########[[/etc/NetworkManager/system-connections/Wi-Ficonnection1]](600root)[connection]id=Wi-Ficonnection1|type=802-11-wireless[802-11-wireless]ssid=Subodh[ipv4]method=auto[ipv6]method=auto#####iwregget########################Region:Asia/Kolkata(basedonsettimezone)country00:(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#####iwlistchannels###################eth0nofrequencyinformation.lonofrequencyinformation.#####iwlistscan#######################eth0Interfacedoesn'tsupportscanning.loInterfacedoesn'tsupportscanning.#####moduleinfos######################[wl]filename:/lib/modules/3.19.0-32-generic/updates/dkms/wl.kolicense:MIXED/Proprietarysrcversion:9A49255BA90267D99664757depends:cfg80211vermagic:3.19.0-32-genericSMPmod_unloadmodversionsparm:passivemode:intparm:wl_txq_thresh:intparm:oneonly:intparm:piomode:intparm:instance_base:intparm:nompc:intparm:intf_name:string[b43]filename:/lib/modules/3.19.0-32-generic/kernel/drivers/net/wireless/b43/b43.kofirmware:b43/ucode9.fwfirmware:b43/ucode5.fwfirmware:b43/ucode16_mimo.fwfirmware:b43/ucode15.fwfirmware:b43/ucode14.fwfirmware:b43/ucode13.fwfirmware:b43/ucode11.fwlicense:GPLauthor:RafałMiłeckiauthor:GáborStefanikauthor:MichaelBueschauthor:StefanoBrivioauthor:MartinLangerdescription:BroadcomB43wirelessdriversrcversion:11BDA0A580599B083FE4F2Bdepends:bcma,ssb,mac80211,cfg80211intree:Yvermagic:3.19.0-32-genericSMPmod_unloadmodversionssigner:Magrathea:Glaciersigningkeysig_key:0C:8B:EF:E0:C1:E2:89:E4:D8:99:09:26:11:7A:DA:3B:DF:EB:41:9Csig_hashalgo:sha512parm:bad_frames_preempt:enable(1)/disable(0)BadFramesPreemption(int)parm:fwpostfix:Postfixforthe.fwfilestoload.(string)parm:hwpctl:Enablehardware-sidepowercontrol(defaultoff)(int)parm:nohwcrypt:Disablehardwareencryption.(int)parm:hwtkip:Enablehardwaretkip.(int)parm:qos:EnableQOSsupport(defaulton)(int)parm:btcoex:EnableBluetoothcoexistence(defaulton)(int)parm:verbose:Logmessageverbosity:0=error,1=warn,2=info(default),3=debug(int)parm:pio:UsePIOaccessesbydefault:0=DMA,1=PIO(int)parm:allhwsupport:Enablesupportforallhardware(evenitifoverlapswiththebrcmsmacdriver)(int)[bcma]filename:/lib/modules/3.19.0-32-generic/kernel/drivers/bcma/bcma.kolicense:GPLdescription:Broadcom'sspecificAMBAdriversrcversion:F17244FFF75F9BDF92327EDdepends:intree:Yvermagic:3.19.0-32-genericSMPmod_unloadmodversionssigner:Magrathea:Glaciersigningkeysig_key:0C:8B:EF:E0:C1:E2:89:E4:D8:99:09:26:11:7A:DA:3B:DF:EB:41:9Csig_hashalgo:sha512[mac80211]filename:/lib/modules/3.19.0-32-generic/kernel/net/mac80211/mac80211.kolicense:GPLdescription:IEEE802.11subsystemsrcversion:6AE775D26377F997426A49Ddepends:cfg80211intree:Yvermagic:3.19.0-32-genericSMPmod_unloadmodversionssigner:Magrathea:Glaciersigningkeysig_key:0C:8B:EF:E0:C1:E2:89:E4:D8:99:09:26:11:7A:DA:3B:DF:EB:41:9Csig_hashalgo:sha512parm:minstrel_vht_only:UseonlyVHTrateswhenVHTissupportedbysta.(bool)parm:max_nullfunc_tries:Maximumnullfunctxtriesbeforedisconnecting(reason4).(int)parm:max_probe_tries:Maximumprobetriesbeforedisconnecting(reason4).(int)parm:beacon_loss_count:Numberofbeaconintervalsbeforewedecidebeaconwaslost.(int)parm:probe_wait_ms:Maximumtime(ms)towaitforproberesponsebeforedisconnecting(reason4).(int)parm:ieee80211_default_rc_algo:Defaultratecontrolalgorithmformac80211touse(charp)[ssb]filename:/lib/modules/3.19.0-32-generic/kernel/drivers/ssb/ssb.kolicense:GPLdescription:SonicsSiliconBackplanedriversrcversion:551AE4C23939F7FBED9DA61depends:intree:Yvermagic:3.19.0-32-genericSMPmod_unloadmodversionssigner:Magrathea:Glaciersigningkeysig_key:0C:8B:EF:E0:C1:E2:89:E4:D8:99:09:26:11:7A:DA:3B:DF:EB:41:9Csig_hashalgo:sha512[cfg80211]filename:/lib/modules/3.19.0-32-generic/kernel/net/wireless/cfg80211.kodescription:wirelessconfigurationsupportlicense:GPLauthor:JohannesBergsrcversion:F28307769349A31F4B24FC2depends:intree:Yvermagic:3.19.0-32-genericSMPmod_unloadmodversionssigner:Magrathea:Glaciersigningkeysig_key:0C:8B:EF:E0:C1:E2:89:E4:D8:99:09:26:11:7A:DA:3B:DF:EB:41:9Csig_hashalgo:sha512parm:ieee80211_regdom:IEEE802.11regulatorydomaincode(charp)parm:cfg80211_disable_40mhz_24ghz:Disable40MHzsupportinthe2.4GHzband(bool)#####moduleparameters#################[b43]allhwsupport:0bad_frames_preempt:0btcoex:1hwpctl:0hwtkip:0nohwcrypt:0pio:0qos:1verbose:2[mac80211]beacon_loss_count:7ieee80211_default_rc_algo:minstrel_htmax_nullfunc_tries:2max_probe_tries:5minstrel_vht_only:Yprobe_wait_ms:500[cfg80211]cfg80211_disable_40mhz_24ghz:Nieee80211_regdom:00#####/etc/modules######################lprtcb43b43b43#####modprobeoptions##################[/etc/modprobe.d/blacklist-ath_pci.conf]blacklistath_pci[/etc/modprobe.d/blacklist-bcm43.conf]blacklistb43blacklistb43legacyblacklistssbblacklistbcm43xxblacklistbrcm80211blacklistbrcmfmacblacklistbrcmsmacblacklistbcma[/etc/modprobe.d/blacklist.conf]blacklistevbugblacklistusbmouseblacklistusbkbdblacklisteepro100blacklistde4x5blacklisteth1394blacklistsnd_intel8x0mblacklistsnd_aw2blacklisti2c_i801blacklistprism54blacklistbcm43xxblacklistgarmin_gpsblacklistasus_acpiblacklistsnd_pcspblacklistpcspkrblacklistamd76x_edac[/etc/modprobe.d/blacklist-rare-network.conf]aliasnet-pf-3offaliasnet-pf-6offaliasnet-pf-9offaliasnet-pf-11offaliasnet-pf-12offaliasnet-pf-19offaliasnet-pf-21offaliasnet-pf-36off[/etc/modprobe.d/iwlwifi.conf]removeiwlwifi\(/sbin/lsmod|grep-o-e^iwlmvm-e^iwldvm-e^iwlwifi|xargs/sbin/rmmod)\&&/sbin/modprobe-rmac80211[/etc/modprobe.d/mlx4.conf]softdepmlx4_corepost:mlx4_en#####rc.local##########################exit0#####pm-utils###############################udevrules########################[/etc/udev/rules.d/70-persistent-net.rules]#PCIdevice0x14e4:0x16b5(tg3)SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x14e4:0x4358 (wl)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
##### dmesg #############################
[ 10.043299] bcma: bus0: Found chip with id 43227, rev 0x00 and package 0x08
[ 10.043328] bcma: bus0: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x25, class 0x0)
[ 10.043348] bcma: bus0: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x1E, class 0x0)
[ 10.043384] bcma: bus0: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x12, class 0x0)
[ 10.043402] bcma: bus0: Core 3 found: SDIO Device (manuf 0x4BF, id 0x829, rev 0x07, class 0x0)
[ 10.054329] bcma: bus0: Bus registered
[ 10.068999] b43-phy0: Broadcom 43227 WLAN found (core revision 30)
[ 10.069968] b43-phy0: Found PHY: Analog 9, Type 4 (N), Revision 16
[ 10.069978] b43-phy0: Found Radio: Manuf 0x17F, ID 0x2057, Revision 9, Version 1
[ 10.279533] b43 bcma0:1: Direct firmware load for b43/ucode30_mimo.fw failed with error -2 (repeated 2 times)
[ 10.279586] b43 bcma0:1: Direct firmware load for b43-open/ucode30_mimo.fw failed with error -2 (repeated 2 times)
[ 10.279597] b43-phy0 ERROR: Firmware file "b43/ucode30_mimo.fw" not found
[ 10.279599] b43-phy0 ERROR: Firmware file "b43-open/ucode30_mimo.fw" not found
[ 10.279603] b43-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all instructions on this website.
[ 10.938573] wl: module license 'MIXED/Proprietary' taints kernel.
[ 10.942985] wl: module verification failed: signature and/or required key missing - tainting kernel
[ 14.230775] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 15.760502] tg3 0000:01:00.0 eth0: Link is up at 100 Mbps, full duplex
[ 15.760508] tg3 0000:01:00.0 eth0: Flow control is on for TX and on for RX
[ 15.760510] tg3 0000:01:00.0 eth0: EEE is disabled
[ 15.760534] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
########## wireless info END ############
O BCM43227 aparentemente precisa do driver STA, que pode ser carregado com
sudo apt-get update
sudo apt-get install --reinstall bcmwl-kernel-source
sudo modprobe -r b43 ssb wl brcmfmac brcmsmac bcma
sudo modprobe wl
A origem deste conjunto de comandos é neste local