I tried installing ath9k from backports looking here for tp-rink wn722nc.

After doing everything I rebooted my computer, but now I don't have wlan0. my internel wifi card is bcm43142 802.11 b/g/n. It's like here.

I had wifi connection before installing ath9k.

modprobe wl:

   modprobe: ERROR: could not insert 'wl': Invalid argument)

lshw -c net :


       description: Ethernet interface

       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: 08
       serial: 50:af:73:6b:33:f4
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8106e-2_0.0.1 04/23/13 ip= latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:105 ioport:1000(size=256) memory:d0504000-d0504fff memory:d0500000-d0503fff

 *-network UNCLAIMED

       description: Network controller
       product: BCM43142 802.11b/g/n
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress cap_list
       configuration: latency=0
       resources: memory:d0400000-d0407fff

lsmod has ath9k at its result, but no wl.

My questions are

  1. Can network manager support 2 wireless drivers?

  2. if not, how do I switch between drivers?

  3. where is my wlan0?

Please help me find wlan0.

  • Add the result of lshw -c net to your question – Jeremy31 Feb 23 '15 at 16:45
  • 1
    Don't do that with Broadcomm drivers! Go here instead: installing broadcom Wireless drivers and report back. – Fabby Feb 23 '15 at 16:48
  • ath9k is a driver for an Atheros wireless card, not Broadcom. – chili555 Feb 23 '15 at 16:55
cd backports-3.16-1
sudo make uninstall

Reboot and if it still doesn't work do:

sudo apt-get update && sudo update-pciids
sudo apt-get install --reinstall bcmwl-kernel-source
  • Thanks, jeremy31 and kasiya. My wlan is working now. Thanks again! – Seyoung Feb 24 '15 at 7:56

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