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**telkel31** · 2026-02-01T14:34:57

Problem solved !

I asked Chatgpt and finally managed to find a solution by a lot of "trials and errors". The problem came from the wifi card firmware not correctly loaded. This is the logs :

Code:

sudo ethtool -i wlp3s0
driver: ath12k_pci
version: 6.17.0-12-generic
firmware-version: N/A
expansion-rom-version:
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

firmware-version: N/A = firmware not correctly loaded. Consequence, my adapter was set on region "World" (country 00) and apply restrictions on allowed frequencies. 5 Ghz and 6 Ghz frequencies were disabled.

Code:

iw reg get
global
country FR: DFS-ETSI
(2400 - 2483 @ 40), (N/A, 20), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
(5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
(5725 - 5875 @ 80), (N/A, 13), (N/A)
(5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
(57000 - 71000 @ 2160), (N/A, 40), (N/A)

phy#0 (self-managed)
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A), NO-80MHZ, NO-160MHZ, NO-320MHZ
2457 - 2482 @ 20), (N/A, 20), (N/A), NO-80MHZ, NO-160MHZ, NO-320MHZ, PASSIVE-SCAN
(5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, NO-320MHZ, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, NO-320MHZ, PASSIVE-SCAN
(5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, NO-320MHZ, PASSIVE-SCAN

The IW REG SET FR command did not work as it was a firmware problem. ath12k files for my adapter were not correctly installed, the solution was to redownload linux-firmware (git clone https://git.kernel.org/pub/scm/linux...x-firmware.git) then copy the files in the right folder :
sudo cp -r linux-firmware/ath12k/* /lib/firmware/ath12k/

and then rebuildinitramfs (I don't understand this step but Chatgpt says it's important so...) :
sudo update-initramfs -u

Then reboot and surprise ! Here they are, 5 ghz and 6 ghz networks detected correctly without any problem ! And a good surprise : better speeds on kubuntu than I had on windows, 1,3 Gbit/s download vs 1,1 with Windows, I can't say why but, hey, just enjoy

.

Thank you for your help guys, I post the solution in case it can help someone else.

**oshunluvr** · Jan 28, 2026, 03:50 PM

ATH12K is the driver. Post your hardware info.

**Snowhog** · Jan 28, 2026, 04:31 PM

Are you 5 and 6 Ghz SSID's hidden?

**telkel31** · Jan 28, 2026, 10:50 PM

Thanks for your reply, my wifi card is a Gigabyte GC-Wifi7, I tried some command to see precise hardware reference, here is the output :

lspci -k | grep -A 3 -i network
03:00.0 Network controller: Qualcomm Technologies, Inc WCN785x Wi-Fi 7(802.11be) 320MHz 2x2 [FastConnect 7800] (rev 01)
Subsystem: Foxconn International, Inc. Device e0fb
Kernel driver in use: ath12k_pci
Kernel modules: ath12k

So it seems to be a Qualcomm Fastconnect 7800 (WCN785x) wifi controller inside.

For Snowhog, my SSID's are not hidden, I can see them on my android phone without problems.

**claydoh** · Jan 28, 2026, 11:37 PM

So, some basics: which Kubuntu release and kernel version.

I am suspecting we need a more current firmware, possibly, maybe, but really the current kernel (which are the same in LTS and current release) should be ok here, supposedly.

**telkel31** · Jan 29, 2026, 01:00 AM

Sorry ! real linux newbie here

lsb_release -a
No LSB modules are available.
Distributor ID:Ubuntu
Description:Ubuntu 25.10
Release:25.10
Codename:questing

uname -r
6.17.0-5-generic

Im surprised this command returns "ubuntu" and not "kubuntu" but maybe this is because kubuntu is derived from ubuntu ?

**claydoh** · Jan 29, 2026, 01:50 AM

Originally posted by telkel31 View Post

Im surprised this command returns "ubuntu" and not "kubuntu" but maybe this is because kubuntu is derived from ubuntu ?

Kubuntu *is* Ubuntu, using Plasma instead of Gnome as the UI. The actual OS is 100% identical.

https://ubuntu.com/desktop/flavors
https://wiki.ubuntu.com/UbuntuFlavors

Things like Linux Mint, neon, and others are actually derived distros, as they usually add their own software repos on top of Ubuntu's

You can also use System Settings, and K Info Center to see system info:

Now, as to the wifi, I have no idea what you need.

Originally posted by telkel31 View Post

6.17.0-5-generic

Have you updated your system since the install? Assuming the 2.4 connection is usable? You seem to be a number of kernel patches behind.

**telkel31** · Jan 29, 2026, 03:48 AM

Thank you for the clarification and k info center tip.

My ISP modem/router has multiples antennas and is able to generate wifi networks on 2.4 Ghz, 5 Ghz and 6 Ghz, I gave them separate SSIDs (network1_2.4GHz, network2_5Ghz and network3_6GHz). I used to connect with 6 ghz wifi network on windows which means about 1 Gbit/s speed in download. On Kubuntu the wifi panel only show network1_2.4GHz. It works flawlessly but at a reduced speed (about 120 Mbit/s).

In discovery, update section says I'm up to date but not sure if this is the good way to check kernel updates.

**claydoh** · Jan 29, 2026, 04:32 AM

Originally posted by telkel31 View Post

In discovery, update section says I'm up to date but not sure if this is the good way to check kernel updates.

Discover is where you'd see them.

I doubt my 25.10 here being a VM has any effect on this, but see mine is at -8

To double check, we can look at what apt thinks

Here is mine:

Code:

$ sudo apt update

<  snipped stuff :)  >

$ apt policy linux-image-generic
linux-image-generic:
Installed: 6.17.0-8.8
Candidate: 6.17.0-8.8
Version table:
*** 6.17.0-8.8 500
           500 http://us.archive.ubuntu.com/ubuntu questing-updates/main amd64 Packages
           500 http://security.ubuntu.com/ubuntu questing-security/main amd64 Packages
          100 /var/lib/dpkg/status
6.17.0-5.5 500
          500 http://us.archive.ubuntu.com/ubuntu questing/main amd64 Packages

**telkel31** · Jan 29, 2026, 04:59 AM

Strange, here is my discover "about this system"

and here the return of apt :
apt policy linux-image-generic
linux-image-generic:
Installé : 6.17.0-8.8
Candidat : 6.17.0-8.8
Table de version :
*** 6.17.0-8.8 500
500 http://archive.ubuntu.com/ubuntu questing-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu questing-security/main amd64 Packages
100 /var/lib/dpkg/status
6.17.0-5.5 500
500 http://archive.ubuntu.com/ubuntu questing/main amd64 Packages

Discover says 6.17.0-5, apt says 6.17.0-8.8.

**telkel31** · Jan 29, 2026, 11:17 AM

Ok I found the problem with kernel, it was from refind, last kernel was installed but not loaded. I was able to switch to kernel 6.17.0-8 but it still didn't change anything.

**telkel31** · 2026-02-01T14:34:57

Problem solved !

I asked Chatgpt and finally managed to find a solution by a lot of "trials and errors". The problem came from the wifi card firmware not correctly loaded. This is the logs :

Code:

sudo ethtool -i wlp3s0
driver: ath12k_pci
version: 6.17.0-12-generic
firmware-version: N/A
expansion-rom-version:
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

firmware-version: N/A = firmware not correctly loaded. Consequence, my adapter was set on region "World" (country 00) and apply restrictions on allowed frequencies. 5 Ghz and 6 Ghz frequencies were disabled.

Code:

iw reg get
global
country FR: DFS-ETSI
(2400 - 2483 @ 40), (N/A, 20), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
(5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
(5725 - 5875 @ 80), (N/A, 13), (N/A)
(5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
(57000 - 71000 @ 2160), (N/A, 40), (N/A)

phy#0 (self-managed)
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A), NO-80MHZ, NO-160MHZ, NO-320MHZ
2457 - 2482 @ 20), (N/A, 20), (N/A), NO-80MHZ, NO-160MHZ, NO-320MHZ, PASSIVE-SCAN
(5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, NO-320MHZ, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, NO-320MHZ, PASSIVE-SCAN
(5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, NO-320MHZ, PASSIVE-SCAN

The IW REG SET FR command did not work as it was a firmware problem. ath12k files for my adapter were not correctly installed, the solution was to redownload linux-firmware (git clone https://git.kernel.org/pub/scm/linux...x-firmware.git) then copy the files in the right folder :
sudo cp -r linux-firmware/ath12k/* /lib/firmware/ath12k/

and then rebuildinitramfs (I don't understand this step but Chatgpt says it's important so...) :
sudo update-initramfs -u

Then reboot and surprise ! Here they are, 5 ghz and 6 ghz networks detected correctly without any problem ! And a good surprise : better speeds on kubuntu than I had on windows, 1,3 Gbit/s download vs 1,1 with Windows, I can't say why but, hey, just enjoy

.

Thank you for your help guys, I post the solution in case it can help someone else.

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Fresh kubuntu install wifi is ok except 5 and 6 ghz band

[SOLVED] Fresh kubuntu install wifi is ok except 5 and 6 ghz band

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