ASUS X551MAラップトップにWIFIドライバーがありません
WIFIはデフォルトでは機能していないようで、オンラインでリソースを見つけることができないようです。どこから探し始めますか？
Lshwの出力は次のようになります
ubuntu
description: Notebook
product: X551MA (ASUS-NotebookSKU)
vendor: ASUSTeK COMPUTER INC.
version: 1.0
serial: E7N0CX295495298
width: 64 bits
capabilities: smbios-2.8 dmi-2.7 vsyscall32
configuration: boot=normal chassis=notebook family=X sku=ASUS-NotebookSKU uuid=11000000-0000-0000-0000-7824AF71EC4C
*-core
description: Motherboard
product: X551MA
vendor: ASUSTeK COMPUTER INC.
physical id: 0
version: 1.0
serial: BSN12345678901234567
slot: MIDDLE
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: X551MA.510
date: 06/27/2014
size: 64KiB
capacity: 960KiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification uefi
*-memory
description: System Memory
physical id: b
slot: System board or motherboard
size: 4GiB
*-bank:0
description: DIMM DDR3 1333 MHz (0.8 ns)
product: HMT451S6BFR8A-PB
vendor: Hynix Semiconduc
physical id: 0
serial: 0B2DF00B
slot: A1_DIMM0
size: 4GiB
width: 64 bits
clock: 1333MHz (0.8ns)
*-bank:1
description: DIMM [empty]
product: Array1_PartNumber1
vendor: A1_Manufacturer1
physical id: 1
serial: A1_SerNum1
slot: A1_DIMM1
*-cache:0
description: L1 cache
physical id: 12
slot: CPU Internal L1
size: 112KiB
capacity: 112KiB
capabilities: internal write-back
*-cache:1
description: L2 cache
physical id: 13
slot: CPU Internal L2
size: 1MiB
capacity: 1MiB
capabilities: internal write-back unified
*-cpu
description: CPU
product: Intel(R) Celeron(R) CPU N2830 @ 2.16GHz
vendor: Intel Corp.
physical id: 14
bus info: cpu@0
version: Intel(R) Celeron(R) CPU N2830 @ 2.16GHz
slot: SOCKET 0
size: 2158MHz
capacity: 2400MHz
width: 64 bits
clock: 83MHz
capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp constant_tsc Arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 movbe popcnt tsc_deadline_timer rdrand lahf_lm 3dnowprefetch ida arat epb dtherm tpr_shadow vnmi flexpriority ept vpid tsc_adjust smep erms cpufreq
configuration: cores=2 enabledcores=2 threads=2
*-pci
description: Host bridge
product: ValleyView SSA-CUnit
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 0e
width: 32 bits
clock: 33MHz
*-display
description: VGA compatible controller
product: ValleyView Gen7
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 0e
width: 32 bits
clock: 33MHz
capabilities: pm msi vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:106 memory:d0000000-d03fffff memory:c0000000-cfffffff ioport:f080(size=8)
*-storage
description: SATA controller
product: ValleyView 6-Port SATA AHCI Controller
vendor: Intel Corporation
physical id: 13
bus info: pci@0000:00:13.0
version: 0e
width: 32 bits
clock: 66MHz
capabilities: storage msi pm ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:104 ioport:f070(size=8) ioport:f060(size=4) ioport:f050(size=8) ioport:f040(size=4) ioport:f020(size=32) memory:d0815000-d08157ff
*-usb
description: USB controller
product: ValleyView USB xHCI Host Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 0e
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:103 memory:d0800000-d080ffff
*-generic UNCLAIMED
description: Encryption controller
product: ValleyView SEC
vendor: Intel Corporation
physical id: 1a
bus info: pci@0000:00:1a.0
version: 0e
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: latency=0
resources: memory:d0500000-d05fffff memory:d0400000-d04fffff
*-multimedia
description: Audio device
product: ValleyView High Definition Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 0e
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:107 memory:d0810000-d0813fff
*-pci:0
description: PCI bridge
product: ValleyView PCI Express Root Port
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: 0e
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:16
*-pci:1
description: PCI bridge
product: ValleyView PCI Express Root Port
vendor: Intel Corporation
physical id: 1c.1
bus info: pci@0000:00:1c.1
version: 0e
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:17 memory:d0700000-d07fffff
*-network
description: Network controller
product: BCM43142 802.11b/g/n
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=bcma-pci-bridge latency=0
resources: irq:17 memory:d0700000-d0707fff
*-pci:2
description: PCI bridge
product: ValleyView PCI Express Root Port
vendor: Intel Corporation
physical id: 1c.3
bus info: pci@0000:00:1c.3
version: 0e
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:19 ioport:e000(size=4096) memory:d0600000-d06fffff
*-generic UNCLAIMED
description: Unassigned class
product: Realtek Semiconductor Co., Ltd.
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list
configuration: latency=0
resources: memory:d0600000-d060ffff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0.2
bus info: pci@0000:03:00.2
logical name: eth0
version: 06
serial: 78:24:af:71:ec:4c
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8402-1_0.0.1 10/26/11 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:105 ioport:e000(size=256) memory:d0614000-d0614fff memory:d0610000-d0613fff
*-isa
description: ISA bridge
product: ValleyView Power Control Unit
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 0e
width: 32 bits
clock: 33MHz
capabilities: isa bus_master cap_list
configuration: latency=0
*-serial UNCLAIMED
description: SMBus
product: ValleyView SMBus Controller
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 0e
width: 32 bits
clock: 33MHz
capabilities: pm cap_list
configuration: latency=0
resources: memory:d0814000-d081401f ioport:f000(size=32)
*-scsi:0
physical id: 1
logical name: scsi0
capabilities: emulated
*-disk
description: ATA Disk
product: ST500LT012-1DG14
vendor: Seagate
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sda
version: 0003
serial: S3P629JM
size: 465GiB (500GB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=5 guid=d249ab9a-2fae-4930-b982-8ae340dab7e1 sectorsize=4096
*-volume:0
description: Windows FAT volume
vendor: MSDOS5.0
physical id: 1
bus info: scsi@0:0.0.0,1
logical name: /dev/sda1
version: FAT32
serial: 4678-a6f6
size: 95MiB
capacity: 99MiB
capabilities: boot fat initialized
configuration: FATs=2 filesystem=fat name=EFI system partition
*-volume:1
description: Windows NTFS volume
vendor: Windows
physical id: 2
bus info: scsi@0:0.0.0,2
logical name: /dev/sda2
version: 3.1
serial: 180a-5752
size: 894MiB
capacity: 899MiB
capabilities: boot precious readonly hidden nomount ntfs initialized
configuration: clustersize=4096 created=2014-05-04 18:16:59 filesystem=ntfs label=Recovery name=Basic data partition state=clean
*-volume:2
description: reserved partition
vendor: Windows
physical id: 3
bus info: scsi@0:0.0.0,3
logical name: /dev/sda3
serial: 741d25f8-9bd3-4026-b122-89f8e5dc06e6
capacity: 127MiB
capabilities: nofs
configuration: name=Microsoft reserved partition
*-volume:3
description: Windows NTFS volume
vendor: Windows
physical id: 4
bus info: scsi@0:0.0.0,4
logical name: /dev/sda4
version: 3.1
serial: 1cf80e29-0c84-d644-a7bf-5c058690830b
size: 186GiB
capacity: 186GiB
capabilities: ntfs initialized
configuration: clustersize=4096 created=2014-05-04 18:17:04 filesystem=ntfs label=OS name=Basic data partition state=clean
*-volume:4
description: Windows NTFS volume
vendor: Windows
physical id: 5
bus info: scsi@0:0.0.0,5
logical name: /dev/sda5
version: 3.1
serial: 6c583a8d-52b5-764d-8f95-9dc41297a86f
size: 131GiB
capacity: 131GiB
capabilities: ntfs initialized
configuration: clustersize=4096 created=2014-08-13 16:49:12 filesystem=ntfs label=Data modified_by_chkdsk=true mounted_on_nt4=true name=Basic data partition resize_log_file=true state=dirty upgrade_on_mount=true
*-volume:5
description: Linux swap volume
vendor: Linux
physical id: 6
bus info: scsi@0:0.0.0,6
logical name: /dev/sda6
version: 1
serial: 3958a59e-e583-45dd-8143-e98654a2c3bc
size: 3982MiB
capacity: 3982MiB
capabilities: nofs swap initialized
configuration: filesystem=swap pagesize=4095
*-volume:6
description: Windows NTFS volume
vendor: Windows
physical id: 7
bus info: scsi@0:0.0.0,7
logical name: /dev/sda7
version: 3.1
serial: 6411-6204
size: 20GiB
capacity: 20GiB
capabilities: boot precious readonly hidden nomount ntfs initialized
configuration: clustersize=4096 created=2014-05-04 18:17:10 filesystem=ntfs label=Restore modified_by_chkdsk=true mounted_on_nt4=true name=Basic data partition resize_log_file=true state=dirty upgrade_on_mount=true
*-scsi:1
physical id: 2
bus info: usb@1:1
logical name: scsi2
capabilities: emulated scsi-Host
configuration: driver=usb-storage
*-cdrom
description: DVD-RAM writer
product: CDDVDW SE-208DB
vendor: TSSTcorp
physical id: 0.0.0
bus info: scsi@2:0.0.0
logical name: /dev/cdrom
logical name: /dev/sr0
logical name: /cdrom
version: TS01
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: mount.fstype=iso9660 mount.options=ro,noatime state=mounted status=ready
*-medium
physical id: 0
logical name: /dev/cdrom
logical name: /cdrom
capabilities: partitioned partitioned:dos
configuration: mount.fstype=iso9660 mount.options=ro,noatime signature=094a46d6 state=mounted
*-volume UNCLAIMED
description: Windows FAT volume
vendor: mkfs.fat
physical id: 2
version: FAT12
serial: 20e8-7ecd
size: 15EiB
capabilities: primary boot fat initialized
configuration: FATs=2 filesystem=fat
*-scsi:2
physical id: 3
bus info: usb@1:2
logical name: scsi3
capabilities: emulated scsi-Host
configuration: driver=usb-storage
*-disk
description: SCSI Disk
physical id: 0.0.0
bus info: scsi@3:0.0.0
logical name: /dev/sdb
size: 14GiB (15GB)
capabilities: partitioned partitioned:dos
configuration: sectorsize=512 signature=0008a6b1
*-volume
description: Windows FAT volume
vendor: mkfs.fat
physical id: 1
bus info: scsi@3:0.0.0,1
logical name: /dev/sdb1
logical name: /media/ubuntu/Kingston
version: FAT32
serial: 3195-501b
size: 14GiB
capacity: 14GiB
capabilities: primary fat initialized
configuration: FATs=2 filesystem=fat label=Kingston mount.fstype=vfat mount.options=rw,nosuid,nodev,relatime,uid=999,gid=999,fmask=0022,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro state=mounted
そのネットワーク部分は
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0.2
bus info: pci@0000:03:00.2
logical name: eth0
version: 06
serial: 78:24:af:71:ec:4c
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8402-1_0.0.1 10/26/11 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:105 ioport:e000(size=256) memory:d0614000-d0614fff memory:d0610000-d0613fff
あなたが持っているワイヤレスのために、それは
Broadcom BCM43142 802.11b/g/n
専用のドライバーをインストールする必要があるかもしれません。
イーサネットポート（ドライバーのダウンロード用）を使用してインターネットに接続し、ダッシュを開いて「ドライバー」を検索してください。このツールが表示されます。 
ドライバーを選択し、「変更を適用」を押します 
トリックを行う必要があります。 （これは14.04でデモされていますが、12.04にも適用できます）