I recently installed Ubuntu 18.04 on my 2009 mac mini. I used a bootable flash drive and all is well. Initially, WiFi adapter where not found, but after going into the Software & Updates > Additional Drivers and installing and using the Broadcom 802.11 Linux STA wireless driver source from bcwl-kernel-source.
However there are no visible WiFi networks even though there are at least three around me as my phone and laptop are connected to them.
I have tried to reinstall the kernel, reinstall the network-manager, and dist-upgrade. Thank you for your help.
Edit
After running lspci -nnk | grep 0280 -A3
I get this for an output:
03:00.0 Network controller [0280]: Broadcom Limited BCM4321 802.11a/b/g/n [14e4:4328] (rev 05)
Subsystem: Apple Inc. AirPort Extreme [106b:0090]
Kernel driver in use: wl
Kernel modules: ssb, wl
And after running sudo iwlist chan
I get:
enp0s10 no frequency information.
lo no frequency information.
enp0s4f1u7c4i2 no frequency information.
wlp3s0 32 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Channel 14 : 2.484 GHz
Channel 32 : 5.16 GHz
Channel 34 : 5.17 GHz
Channel 36 : 5.18 GHz
Channel 38 : 5.19 GHz
Channel 40 : 5.2 GHz
Channel 42 : 5.21 GHz
Channel 44 : 5.22 GHz
Channel 46 : 5.23 GHz
Channel 48 : 5.24 GHz
Channel 50 : 5.25 GHz
Channel 52 : 5.26 GHz
Channel 54 : 5.27 GHz
Channel 56 : 5.28 GHz
Channel 58 : 5.29 GHz
Channel 60 : 5.3 GHz
Channel 62 : 5.31 GHz
Channel 64 : 5.32 GHz
Channel 66 : 5.33 GHz
After running sudo iw reg get
I get:
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
Using the nmcli dev wifi list
command I get:
(process:2078): libnm-WARNING **: 20:27:42.549: no object known for /org/freedesktop/NetworkManager/ActiveConnection/1
IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
Best Answer
This will be a partial answer until we uncover more facts.
I recommend that your regulatory domain be set explicitly. Check yours:
If you get 00, that is a one-size-maybe-fits-all setting. Find yours here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 Then set it temporarily:
Of course, substitute your country code if not Iceland. Set it permanently:
Change the last line to read:
Proofread carefully, save and close the text editor.
Reboot. Run and post:
We are confident that channels above 66 will now be available.