HP Elitebook HPlt4120 - WLAN works while installation and on first Boot - then no more

Installing Zorin OS
1

HP Elitebook HPlt4120 - WLAN works while installation and on first Boot - then no more

I installed Zorin OS 17 on four tiny PCs on the job, and they still work.
Happy with that.

Now I installed Zorin OS 18 on a HP Elitebook HPlt4120, replacing Windows 10.
While installation I can choose WLAN, and I can successfully input the security data to access the local WLAN.

Then, on first boot, I can use the browser, install packages from the web (Lazarus RAD) and so on ..

But on next boot WLAN is deactivated, no internet, no connection.
I found no hint in the WWW how to unlock the WLAN driver.

Any ideas ?

2

What is the terminal output of

sudo lshw -C network

and

rfkill list

?

When WLAN worked first you could try to boot into an older kernel. During boot press etc (or if you have a legacy BIOS left shift key) to show grub menu and there select Advanced Options for Zorin. Then select an older kernel to boot from and see if it helps. If you have wlan then you can set this kernel as default to boot.

I only found posts about a lte modem with this number and that it would help to add a udev rule to
/etc/udev/rules.d/.
Create an empty textfile,
copy the content of the long grey field, replace the "1" with "3" at the end of the line
-p 9d1d --configuration 1", and save it with root rights at

/etc/udev/rules.d/99-hp-lt4120.rules

It is a German site I hope you can translate it. There are links that lead to launchpad if you want to see english posts but they are not so clear.

But I'm not sure if it helps to do this because you wrote about wlan. And this guide is for the LTE modem lt4120.

3

Welcome to the Forum!

Did You take a Look at the ''Additional Drivers'' Tab in Software & Updates if there is a Driver offered? And have You the Wifi Setting in Settings>Wifi or doesn't exist it?

4

Thanx for Your replies, I was busy with other issues (heat pump) which where more urgent. :cold_face:

I'll have a look at it next days, thanks !

1 Like
5

Hello @Ponce-De-Leon,
in Settings both Network and Bluetooth are disabled.
Actually I didn't find the ''Additional Drivers'' Tab anywhere, sorry.

6

Hello @Forpli,
sudo lshw -C network:

*-network DEAKTIVIERT
Beschreibung: Kabellose Verbindung
Produkt: Wireless 8260
Hersteller: Intel Corporation
Physische ID: 0
Bus-Informationen: pci@0000:02:00.0
Logischer Name: wlp2s0
Version: 3a
Seriennummer: a4:34:d9:a1:39:6b
Breite: 64 bits
Takt: 33MHz
Fähigkeiten: pm msi pciexpress bus_master cap_list ethernet physical wireless
Konfiguration: broadcast=yes driver=iwlwifi driverversion=6.14.0-35-generic firmware=36.ca7b901d.0 8000C-36.ucode latency=0 link=no multicast=yes wireless=IEEE 802.11
Ressourcen: irq:127 memory:e1100000-e1101fff
*-network DEAKTIVIERT
Beschreibung: Ethernet interface
Produkt: Ethernet Connection I219-LM
Hersteller: Intel Corporation
Physische ID: 1f.6
Bus-Informationen: pci@0000:00:1f.6
Logischer Name: enp0s31f6
Version: 21
Seriennummer: fc:3f:db:fd:4d:5f
Kapazität: 1Gbit/s
Breite: 32 bits
Takt: 33MHz
Fähigkeiten: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
Konfiguration: autonegotiation=on broadcast=yes driver=e1000e driverversion=6.14.0-35-generic firmware=0.12-4 latency=0 link=no multicast=yes port=twisted pair
Ressourcen: irq:123 memory:e1200000-e121ffff
*-network DEAKTIVIERT
Beschreibung: Ethernet interface
Physische ID: c
Bus-Informationen: usb@1:3
Logischer Name: wwan0
Seriennummer: e2:58:e2:4e:8e:bc
Fähigkeiten: ethernet physical
Konfiguration: autonegotiation=off broadcast=yes driver=cdc_mbim driverversion=6.14.0-35-generic duplex=half firmware=CDC MBIM link=no multicast=yes port=twisted pair

7

rfkill list:

1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no

8

Try rfkill unblock hci0

Another Thing: Do You have on Your Machine a physical Switch to enable/disable Wifi/Bluetooth? If yes, check it.

Open Software & Updates:

Bildschirmfoto vom 2025-11-17 12-10-35
Bildschirmfoto vom 2025-11-17 12-10-352212Ă—1512 148 KB

And one the right is the Tab.

Can You enable them by clicking on the Toggle?

9

There's no "toggle".
Settings/Network says: Network not available + NetworkManager not running

10

I can't find "Software & Updates" in Zorin OS 18 anywhere ..

11

"WIFI Setting" does not exist in Settings

12

A physical Switch exists, when RED, a popup shows "airplane mode".
But button is aktive / "on".

13

The name of the app Software&Updates depends on your language. You find it in Zorin start menu or the app overview. What language do you use? In German it is called "Anwendungen & Aktualisierungen".
You can also open the software store and click on the Hamburger menu and then select Software&Updates.

You can try to restart the network manager with

sudo systemctl restart NetworkManager
14

In German it is ''Anwendungen & Aktualisierungen'' like You see on the Screenshot above.

16

The output of this command you can see in post #6.

1 Like
17

Okay, found the Dialog this way. Result:

"Keine zusätzlichen Treiber verfügbar."
(No additional drivers available)

18

Result:

"Failed to restart NetworkManager.service: Unit NetworkManager.service not found."

19

I'm not sure what can help you. You could try to check the NetworkManager status and if it shows that it is inactive you could try to install it:

20

Thanks for all the help !

I overwrote Zorin OS 18 Core with Zorin OS 17.3 Core now.
And after several reboots WLAN still works.

So no need to dig deeper ..

1 Like