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[Ofer Cohen <oc666@xxxxxxxxxxxxxxxx>]

I've encountered the issue and to solve it I just run the next command:
# sudo rmmod b43 && sudo rmmod bcma && sudo rmmod wl && sudo modprobe wl && sudo modprobe lib80211_crypt_tkip

It seems that b43 or bcma are collisions to the wl module.

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https://bugs.launchpad.net/bugs/1315265

Title:
  Broadcom Device BCM43142 Wireless Driver for Ubuntu 14.04 LTS 64Bit
  Desktop not working out of box

Status in “network-manager” package in Ubuntu:
  Confirmed

Bug description:
  $ lsb_release -rd
  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  $ apt-cache policy network-manager
  network-manager:
    Installed: 0.9.8.8-0ubuntu7
    Candidate: 0.9.8.8-0ubuntu7
    Version table:
   *** 0.9.8.8-0ubuntu7 0
          500 http://in.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  
  After installing Ubuntu 14.04 Desktop version 64 bit on my Dell Vostro 2520 Laptop, I expected the wirless card to automatically be detected and to be able to connect to any wireless network for seamless internet access. 

  However, the driver for wifi did not get automatically installed. I
  looked around for some information in the web and found a blog
  suggestion to run the following command for wifi to work:

  $sudo apt-get install linux-headers-generic build-essential dkms

  After running this command, I found the driver to show up in the right
  corner, but when I select a wifi network, I saw another error:

  (1) Creating object for path
  '/org/freedesktop/NetworkManager/ActiveConnection/2' failed in libnm-
  glib.

  I tried asking in the freenode ubuntu irc chatroom but did not get any
  solutions.

  After trying out several suggestions from the chat room, nothing
  worked.

  Workaround:
  Finally, through nm-applet I clicked on "Edit Connections" and selected the wifi network I was trying to add. Then in the security settings, I typed the password for accessing the wifi and configured it. 

  When I unplugged my LAN and restarted wifi, it worked. Now I am able
  to access the wifi.

  The forum member in Ubuntu chatroom suggested I file a bug:

  To summarize the issue is, there is no inbuilt driver for Broadcom
  BCM43142 Network Controller.

  Please help fix this in the next update.  Let me know if you need any
  further information.

  Thanks
  Sharath

  $ lsusb
  Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 001 Device 004: ID 0c45:6473 Microdia 
  Bus 001 Device 003: ID 0a5c:21d7 Broadcom Corp. BCM43142 Bluetooth 4.0
  Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

  $ lspci 
  00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
  00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
  00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
  00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
  00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
  00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
  00:1c.3 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 4 (rev c4)
  00:1c.5 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 6 (rev c4)
  00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
  00:1f.0 ISA bridge: Intel Corporation HM75 Express Chipset LPC Controller (rev 04)
  00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
  00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
  07:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
  09:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)

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