My Problem was just a naming issue :-

$ dmesg | grep -i 'bluetooth'

if you are facing some naming problem,the output of above command should
be somthing like this ->

Bluetooth hci0: Direct firmware load for brcm/BCM43142A0-0489-e062.hcd failed 
with error -2
Bluetooth: hci0: BCM: Patch brcm/BCM43142A0-0489-e062.hcd not found

The Problem here is in this folder : /lib/firmware/brcm

$ ls /lib/firmware/brcm/*.hcd

The above command gives output of some *.hcd file (in my case BCM.hcd).
But my kernal is looking for BCM43142A0-0489-e062.hcd. 
All you need to do is make a copy and rename.

$ cp /lib/firmware/brcm/BCM.hcd
/lib/firmware/brcm/BCM43142A0-0489-e062.hcd (in my case)

Restart the PC and will see the frimware is loaded.

Now you can see bluetooh is working.

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  BCM43142 bluetooth adapter not finding any bluetooth devices

Status in bluez package in Ubuntu:

Bug description:
  On my officially Ubuntu-certified Lenovo B590 laptop the BCM43142
  bluetooth adapter is not working. I have two further bluetooth devices
  placed closely to the laptop, non-paired and each being able to
  discover the other respectively. None of them is able to discover the
  laptop, nor does 'hcitool scan' on the laptop find any devices. It
  does not give any errors though.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: bluez 4.101-0ubuntu8b1
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  Date: Thu Dec 26 15:34:08 2013
  InstallationDate: Installed on 2013-12-25 (0 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 
  InterestingModules: bnep rfcomm btusb bluetooth
  MachineType: LENOVO 37613EG
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-14-generic 
root=UUID=c379c17a-9869-47a8-b9b3-83be4e302040 ro acpi_backlight=vendor quiet 
splash vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install) 06/26/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: H9ET74WW(1.11)
  dmi.board.asset.tag: Not Available 37613EG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvrH9ET74WW(1.11):bd06/26/2013:svnLENOVO:pn37613EG:pvrLenovoB590:rvnLENOVO:rn37613EG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: 37613EG
  dmi.product.version: Lenovo B590
  dmi.sys.vendor: LENOVO
   hci0:        Type: BR/EDR  Bus: USB
        BD Address: 1C:3E:84:E8:81:98  ACL MTU: 1021:8  SCO MTU: 64:1
        RX bytes:1244 acl:0 sco:0 events:81 errors:0
        TX bytes:2820 acl:0 sco:0 commands:77 errors:0

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