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I've installed a fresh copy of Xubuntu 15.04 and I can't get my Broadband B4311 Wifi card working. I had Ubuntu GNOME 14.04, and I solved the problem using the b43 driver, so I'd already done a lot of tweaking, now neither the b43 driver or the Broadcom proprietary driver works. Is this kernel related? Has anyone had the same problem?

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  • Can you add the result of ls /etc/modprobe.d/ | grep bcm43 and lspci -nnk | grep 280
    – Jeremy31
    Apr 26, 2015 at 10:52
  • - alsa-base.conf blacklist.conf blacklist-modem.conf blacklist-watchdog.conf intel-microcode-blacklist.conf vmwgfx-fbdev.conf blacklist-ath_pci.conf blacklist-firewire.conf blacklist-oss.conf dkms.conf iwlwifi.conf blacklist-broadcom-wireless.conf blacklist-framebuffer.conf blacklist-rare-network.conf fbdev-blacklist.conf mlx4.conf
    – Cláudio Palma
    Apr 26, 2015 at 11:00
  • - 00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev e2) 00:1f.0 ISA bridge [0601]: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge [8086:27b9] (rev 02) 00:1f.1 IDE interface [0101]: Intel Corporation 82801G (ICH7 Family) IDE Controller [8086:27df] (rev 02) 00:1f.2 SATA controller [0106]: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [AHCI mode] [8086:27c5] (rev 02) 02:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01)
    – Cláudio Palma
    Apr 26, 2015 at 11:05
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    I've just edit blacklist-broadcom-wireless.conf and the b43 driver was blacklisted, i guess i was very sleepy last night, i just remove it and runned sudo update-initramfs -u and it's done. Thank you very much. Now i feel bad for starting this
    – Cláudio Palma
    Apr 26, 2015 at 11:28
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    As long as it works now
    – Jeremy31
    Apr 26, 2015 at 11:31

2 Answers 2

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Correction:

Actually, the correct file to edit on gedit is /etc/modprobe.d/blacklist-bcm43.conf since this file is for the Broadcom 43xx series wifi chipsets. Don't forget to reboot the PC once these changes are made to take into effect.

So to put it into steps (for some people who don't get what I'm talking about):

Open Terminal by pressing Ctrl+Alt+T

Type 

sudo apt-get install firmware-b43-installer
gksudo gedit /etc/modprobe.d/blacklist-bcm43.conf

Comment out (by putting a # at the start of the line) any items with the words bcm43 or bcm43xxx in them. Save the file and close gedit once you're done with these changes.

Reboot the PC.

NOTE: some PCs may require you to activate the wifi card through either a combo key press (FN + F# or an unknown side/front switch) before you can see your wifi networks on the Network Connections.

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sudo apt-get install firmware-b43-installer
sudo -H gedit /etc/modprobe.d/blacklist-broadcom-wireless.conf

removed the line with b43

sudo update-initramfs -u

Details found here on the help.ubuntu.com wiki

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