I'm on Elementary OS 0.4 and i've a problem with the wifi connection, i tryied to fix it with all i've found on the web, but it still doesn't work. With " lshw -C network " i got that:

*-network UNCLAIMED
   description: Network controller
   product: BCM43142 802.11b/g/n
   vendor: Broadcom Corporation
   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:f7800000-f7807fff

Could anyone help me? I'm a noob.

  • Surfing on the web i read about a blacklist so i use this command to verify and i get this: 'grep -R brcm /etc/modprobe.d /etc/modprobe.d/blacklist-bcm43.conf:blacklist brcm80211 /etc/modprobe.d/blacklist-bcm43.conf:blacklist brcmfmac /etc/modprobe.d/blacklist-bcm43.conf:blacklist brcmsmac' – Andrea De Luca Oct 1 '16 at 11:20
  • @lemonslice with the command iwconfig i get: enp2s0 no wireless extensions. (that is the Ethernet interface) lo no wireless extensions. (i don't know what is this) – Andrea De Luca Oct 1 '16 at 14:18
  • Instead of writing "SOLVED" in your questions title please accept the best answer by clicking the checkmark ✓ – quassy Oct 1 '16 at 23:39
  • How did you fix it? I now have the same problem. How did you disable secure mode? – Talita Montenegro Oct 29 '19 at 17:46

SOLVED the problem was that secure boot was enabled, now wireless connection is shown in the option and works!

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  • Hi Andrea, this answer might be more helpful to other searchers if you added the steps you took to rectify your issue – wolf Oct 1 '16 at 19:13

You're missing the Broadcom drivers, open terminal and paste

sudo apt install bcmwl-kernel-source

Reboot your machine and try to connect to the wifi.

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  • Thank you Giovanni, this is what i got now: bcmwl-kernel-source is already the newest version ( – Andrea De Luca Oct 1 '16 at 8:49
  • Is the wifi working now? – Giovanni Caligaris Oct 4 '16 at 10:31
  • Yes, now it works, but the problem was the secure boot enabled! – Andrea De Luca Oct 5 '16 at 11:18

You might have to execute iwconfig manually (the card is there but it is down):

sudo ifconfig wlp4s0 up
service network-manager restart

(Source: https://askubuntu.com/questions/760075/cant-view-wifi-networks-after-upgrading-to-ubuntu-16-04)

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In my case with Hp laptop the solution was disable secure boot and enable legacy tutorial here https://support.hp.com/us-en/document/c04784866

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