After regular update from Ubuntu 14.04 wireless network is not working

Question

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

Possible duplicate of Why do I get "Required key not available" when install 3rd party kernel modules or after a kernel upgrade? — Pilot6, Aug 14 '16 at 10:25
Please [edit] your question and add output of lspci -knn | grep Net -A2 terminal command. — Pilot6, Aug 14 '16 at 10:25
See also http://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers — Pilot6, Aug 14 '16 at 11:19
Other one is not showing any result, i waited for at least 7-10 mins but there were no result. Please suggest if i try it again. Regards, Shk. — SHK, Aug 14 '16 at 11:19
There are no 2 commands: one and the other. It was supposed to be run as one command. — Pilot6, Aug 14 '16 at 11:20
My apologies, i am sending is now.. please suggest 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:~$ — SHK, Aug 14 '16 at 13:33
Please paste it to your question. It is unreadable here. But it is clear what happened. — Pilot6, Aug 14 '16 at 13:40
This is a duplicate of http://askubuntu.com/questions/55868/installing-broadcom-wireless-drivers — Pilot6, Aug 14 '16 at 15:09

score 1 · Accepted Answer · answered Aug 14 '16 at 13:43

1

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

answered Aug 14 '16 at 13:43

Pilot6

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It is still not showing network. Do I need to give some more commands? – SHK Aug 14 '16 at 15:01
Install firmware-b43-installer then. – Pilot6 Aug 14 '16 at 15:01
It says missing destination file operand after 'firmware-b43-installer' – SHK Aug 14 '16 at 15:08
What do you run? The command is sudo apt install firmware-b43-installer. – Pilot6 Aug 14 '16 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 '16 at 15:17
You need to close all other applications or reboot. And you need to be connected to internet. – Pilot6 Aug 14 '16 at 15:18
My windows is fine with Internet so can I download some files and put them there in Ubuntu... Ubuntu is not having network.. – SHK Aug 14 '16 at 15:22
http://askubuntu.com/a/730813/167850 – Pilot6 Aug 14 '16 at 15:24
All worked fine. Now i have wireless. Shall i upgrade to 15.10 as updater is asking for it? do i need to complete any prerequisites? -- SHK. – SHK Aug 15 '16 at 12:46

After regular update from Ubuntu 14.04 wireless network is not working

1 Answers1