This is a solved problem, but I think it might help other newbies like me.

It might also work on other Linux distros with the same problem.

You can read here or read my post on Oracle Forums.

I can't provide much technical information as I lack the knowledge.

I have an old laptop on which Oracle Linux 9 works fine out of the box, but Oracle Linux 10 doesn't show the Wi-Fi option. Upon searching Wi-Fi (by pressing the windows key), it shows the Wi-Fi tab in Options. It said Wi-Fi adaptor not found.

Credit is given where it is due, the solution was found after consulting Bing.

Solution:

1. Find the firmware OL 9 is using by using terminal command: (a version of iwlwifi for me, it might be different for you.)

   dmesg | grep iwlwifi | grep firmware

2. Copy the firmware displayed by the above command to a storage device. I did it by copying it to the Documents folder in my home folder and then use the Files app in Graphical User Interface (GUI).

   You may also try to download the firmware on https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/

   cp /lib/firmware/[firmware filename] ~/Documents

   In GUI, copy it to your storage device  

3. On OL 10, copy the firmware to /lib/firmware/

   cp ~/Documents/[firmware filename] /lib/firmware

4. Reload the driver

   sudo modprobe -r iwlwifi
   sudo modprobe iwlwifi

5. Restart NetworkManager

   sudo systemctl restart NetworkManager

That's it. The Wi-Fi tab shows like it does on OL 9.

Hope this help.

Credit: Bing, or Copilot.