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I have a Dell Inspiron 15R that came preinstalled with Windows 8.1 I just installed Ubuntu 12.04 in dual boot and got it working. Now i cannot connect to wifi. I tried How do I install BCM43142 wireless drivers for Dell Vostro 3460/3560? and also other methods involving installing firmware-b43-installer and b43-fwcutter. Nothing works. rfkill list all only shows Bluetooth:

rfkill list all

0: hci0: Bluetooth

Soft blocked: no
Hard blocked: no

vipluv@Krishnakshetra:~$

My wireless hardware isn't detected at all! What do i do?

EDIT:

output for lspci -nnk | grep -iA2 net:

    01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 07)
        Subsystem: Dell Device [1028:05e9]
        Kernel driver in use: r8169

02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
    Kernel driver in use: bcma-pci-bridge

and for iwconfig:

eth0      no wireless extensions.

lo        no wireless extensions.
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Step one: Connect your system to the network temporarily using an Ethernet cable.

Step two: Open a terminal and issue the commands: sudo apt-get update and then after that completes, sudo apt-get upgrade

Step three:

Open Additional Drivers and install what is recommended. If there aren't any needed or recommended you'll see this:

additionaldrivers

If your wireless hardware isn't detected at all, consider trying a USB wifi adapter as the integrated one may be damaged somehow.

  • I installed the drivers... Now it says 'Activated but not in use' and still refuses to detect the wifi. Any tips? – user306084 Jul 29 '14 at 13:05
  • Insure wireless networking is activated and the indicator led for your wireless is on. – Elder Geek Jul 30 '14 at 16:05
  • I had done that back then, as well! :-/ I tried a hundred different things after that, then gave up. My ubuntu still doesn't detect wireless. It's been a while, i know, but could you still help? – user306084 Jan 20 '15 at 11:37
  • Expanded answer - without knowing the "hundred things" you've tried it's hard to say which helped and which made things worse.... – Elder Geek Jan 20 '15 at 14:10

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