I can't see any available WiFi networks or anything that even resembles WiFi settings. Output of lshw -C network

 lshw -C network
 WARNING: you should run this program as super-user.
 *-network UNCLAIMED
   description: Network controller
   product: BCM43142 802.11b/g/n
   vendor: Broadcom Limited
   physical id: 0
   bus info: pci@0000:03:00.0
   version: 01
   width: 64 bits
   clock: 33MHz
   capabilities: bus_master cap_list
   configuration: latency=0
   resources: memory:f7900000-f7907fff

Output of lspci -knn | grep Net -A3:

lspci -knn | grep Net -A3
    03:00.0 Network controller [0280]: Broadcom Limited BCM43142
802.11b/g/n [14e4:4365] (rev 01)
        Subsystem: Lite-On Communications Inc BCM43142 802.11b/g/n [11ad:6605]
        Kernel modules: wl
    04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.

RTL8411B PCI Express Card Reader [10ec:5287] (rev 01)

Output of wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && chmod +x wireless-info && ./wireless-info


  • 1
    Disable Secure Boot.
    – Pilot6
    Jun 12, 2017 at 18:38
  • @Pilot6 Already done. Jun 12, 2017 at 21:19
  • Please edit the file /etc/modules to remove the entry ath9k Reboot and show us the exact response to the terminal command: sudo modprobe wl && dmesg | grep wl Welcome to Ask Ubuntu.
    – chili555
    Jun 12, 2017 at 21:31
  • @chili555 sudo modprobe wl && dnesg|grep wl Output: modprobe: ERROR: could not insert 'wl': Required key not available Jun 13, 2017 at 7:06
  • Secure Boot is enabled.
    – Pilot6
    Jun 13, 2017 at 7:33

1 Answer 1


There is a confirmed bug on Ubuntu where wifi will fail to show or respond at all. Generally this will occur only after your computer enters suspend and then resumes. https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1574347

Are you still able to use wifi? Do you have access to any wifi immediately after a reboot?


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