You're using a Broadcom Wifi card, have you tried to install a proprietary 
driver for it?
http://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers

0d:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n 
[14e4:4365] (rev 01)
        Subsystem: Hewlett-Packard Company Device [103c:804a]
        Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 255
        Region 0: Memory at c3000000 (64-bit, non-prefetchable) [size=32K]
        Capabilities: <access denied>

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1661941

Title:
  cant connect to wifi

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  i am not able to connect to wifi. there is no enable wifi option in
  network menu. how can i solve this issue

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-108-generic 3.13.0-108.155
  ProcVersionSignature: Ubuntu 3.13.0-108.155-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-108-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.23
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vaishu     1624 F.... pulseaudio
   /dev/snd/controlC0:  vaishu     1624 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Feb  5 15:14:16 2017
  HibernationDevice: RESUME=UUID=c2875e73-69d3-4af6-a684-4549c277bfdd
  InstallationDate: Installed on 2015-08-25 (530 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 064e:930b Suyin Corp. 
   Bus 001 Device 002: ID 0a5c:216d Broadcom Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: HP HP Notebook
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-108-generic.efi.signed 
root=UUID=9908fc28-804a-4434-bebe-3936e27dfd42 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-108-generic N/A
   linux-backports-modules-3.13.0-108-generic  N/A
   linux-firmware                              1.127.23
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2017-01-09 (26 days ago)
  dmi.bios.date: 05/17/2016
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.21
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 80C1
  dmi.board.vendor: HP
  dmi.board.version: 96.47
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.21:bd05/17/2016:svnHP:pnHPNotebook:pvrType1ProductConfigId:rvnHP:rn80C1:rvr96.47:cvnHP:ct10:cvrChassisVersion:
  dmi.product.name: HP Notebook
  dmi.product.version: Type1ProductConfigId
  dmi.sys.vendor: HP

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