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Wireless network is not detected, says Disconnected - you are offline on start. This has started happening only after I updated Ubuntu 14.04 through Software Updater.

I did try with downgrading libnl those 3 files to 302.21-1 but no use. I tried with sudo services network-manager restart but no use.

Tried with uninstalling and reinstalling driver but no use.

I also tried with Advance recovery but no use.

Please help with this issue.


shaukat@shk-Inspiron-1545:~$ lspci -knn|grep Net -A2
0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
    Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]

shaukat@shk-Inspiron-1545:~$ grep b43 /etc/modprobe.d/*
/etc/modprobe.d/blacklist-bcm43.conf:blacklist b43
/etc/modprobe.d/blacklist-bcm43.conf:blacklist b43legacy
/etc/modprobe.d/blacklist.conf:# replaced by b43 and ssb.
shaukat@shk-Inspiron-1545:~$ 

Regards, SHK

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1 Answer 1

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A wrong driver is installed, it blacklisted the correct one.

If the firmware is installed, you can enable Wi-Fi by

sudo modprobe b43

You also need to remove the wrong driver by

sudo apt purge bcmwl-kernel-source
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  • It is still not showing network. Do I need to give some more commands?
    – SHK
    Aug 14, 2016 at 15:01
  • Install firmware-b43-installer then.
    – Pilot6
    Aug 14, 2016 at 15:01
  • It says missing destination file operand after 'firmware-b43-installer'
    – SHK
    Aug 14, 2016 at 15:08
  • What do you run? The command is sudo apt install firmware-b43-installer.
    – Pilot6
    Aug 14, 2016 at 15:09
  • It says unable to fetch some archive then apt-get update is also showing unable to lock administration directory etc.
    – SHK
    Aug 14, 2016 at 15:17

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