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First off, let me start by saying that I am well aware that many other people have asked similar questions, and have had their questions answered and their problems solved. I am here because I have attempted a range of the solutions already posted, and none of them have worked.

Some background: I am running Ubuntu 16.04 off of a flash drive. The WiFi does not work. But, it's not just that I try to connect to a network, and it doesn't connect; rather, the idea of WiFi itself seems to be a foreign concept to the system. Nowhere is there any option to even see available WiFi networks. Clicking on the network icon yields: (parentheses indicate grayed-out):

(Ethernet network)
(disconnected)
VPN Connections→
Enable Networking – this is checked
(Connection information)
Edit connections

If I run service network-manager restart, which some guides say will fix the wifi menu, I get a notification that I am now disconnected, and more options become grayed out. I've also tried typing nm-applet in terminal and that did nothing.

One post suggested running sudo ifconfig wlp4s0 up. This did nothing, and gave the message: wlp4s0: ERROR while getting interface flags: no such device.

Running sudo modprobe -wl yields: Error: Could not insert wl: required key not available. Researching that, it seems that the error comes from having secure boot enabled. So I go into the BIOS, disable secure boot, and then run the command again, and get the same result.

After disabling secure boot, I then tried running sudo apt-get purge bcmwl-kernel-source then sudo apt-get install linux-generic bcmwl-kernel-source, rebooted, and there was no effect.

My wifi card is Broadcom BCM4312 802.11b/g/n and my PCI Id is 14e4:4365 (rev 01). This information in hand, I followed the instructions of another post, which suggested I go to /etc/pm/config and edit config.d, adding SUSPEND_MODULES="BCM4312". There was no config.d file in that directory, and I was told I did not have permission to save a file there, which makes no sense because I am the only user.

I've gone into Settings > Software and Updates, and enable the Broadcom wifi card.

Output of iwconfig:

lo    no wireless extensions
enp14s0   no wireless extensions

I'm not sure what that means.

I've tried all the steps at the following posts:

And non of them seem to work. I am not sure where to go from here. Any help would be greatly appreciated. Thank you.

  • The "no wireless extensions" message means the device isn't a wireless network device (lo is the loopback interface, and I'm assuming enp14s0 is a wired interface of sorts). For some reason the device isn't being given an interface in the system, possibly due to driver failure. Can you post dmesg output please? – Kim Phillips Dec 6 '16 at 5:19
  • The output of dmesg is over 25 pages- it's too long to post here. Anything specific you're looking for? – Dan V Dec 6 '16 at 20:47
  • Just a comprehensive detailed log of all PCI bridges, devices, wireless networking, and driver (and any more of its dependencies) possibly failing. I don't think it's a problem to post 25 pages here, it goes into a scrollable box, but if there's anything you specifically don't want to share (avant-garde h/w), then by all means trim away. One can also post places like pastebin if necessary, just not sure how long they'll last there vs. this askubuntu entry. – Kim Phillips Dec 7 '16 at 18:57
  • Please do: sudo apt-get install bcmwl-kernel-source. After it finishes, reboot and run these commands and show us the results: sudo modprobe wl (not -wl) and also: rfkill list all Welcome to AskUbuntu. – chili555 Dec 7 '16 at 22:09

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