Ubuntu 18.04 WiFi Networks are not displaying even though there are 3 nearby
This will be a partial answer until we uncover more facts.
I recommend that your regulatory domain be set explicitly. Check yours:
sudo iw reg get
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:
sudo iw reg set IS
Of course, substitute your country code if not Iceland. Set it permanently:
sudo nano /etc/default/crda
Change the last line to read:
REGDOMAIN=IS
Proofread carefully, save and close the text editor.
Reboot. Run and post:
sudo iwlist chan
We are confident that channels above 66 will now be available.
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Lucas Kohorst
Updated on September 18, 2022Comments
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Lucas Kohorst over 1 year
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
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Jeremy31 over 5 yearsAre the networks on a 2.4 GHz channel higher than 11?
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Lucas Kohorst over 5 years@Jeremy31 How could I check that?
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Jeremy31 over 5 yearsA wifi scanner app for the phone?
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Lucas Kohorst over 5 yearsYes the channel is 161
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chili555 over 5 yearsPlease edit your question to show:
lspci -nnk | grep 0280 -A3
and also:sudo iwlist chan
and also:sudo iw reg get
Welcome to Ask Ubuntu. -
Lucas Kohorst over 5 years@chili555 Thank you I have edited my answer.
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chili555 over 5 yearsDid the 'chan' reading actually end at channel 60? Or was something lost in copy and paste? What does this tell us?
nmcli dev wifi list
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Lucas Kohorst over 5 years@chili555 the 'chan' reading ended on channel 66. I copy and pasted that. I also updated my answer to show the output of the
nmcli dev wifi list
command
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Lucas Kohorst over 5 yearsNow all of the wifi networks are visible! Thank you so much!