Getting "No Wifi adaptor found" for ubuntu 18.04 in DELL precision - ubuntu-18.04

Question

I use DELL Precision 3541.
After rebooting my laptop, I am getting "No Wifi adaptor found". So I tried few solutions mentioned in stackoverflow. But when I hit sudo lshw -C network
I am getting this in response
description: Network controller
product: Wireless-AC 9560 [Jefferson Peak]
vendor: Intel Corporation
physical id: 14.3
bus info: pci#0000:00:14.3
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list
configuration: driver=iwlwifi latency=0
resources: irq:16 memory:ed43c000-ed43ffff
*-network:1
description: Ethernet interface
product: Ethernet Connection (7) I219-V
vendor: Intel Corporation
physical id: 1f.6
bus info: pci#0000:00:1f.6
logical name: eno2
version: 10
serial: 34:48:ed:03:b3:22
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.5-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:172 memory:ed400000-ed41ffff
There is no logical name for my wifi adaptor.
Is there any way I can enable the wifi adaptor on my laptop?

Answer 1

I tried something random. Dont know how it worked for me. Just followed the steps.
1.Restarted my Laptop.
2.Entered BOIS setup (F12).
3.Then inside the wireless section, I completely disabled WLAN.
4.When it booted up successfully, Restarted Laptop again.
5.Entered BOIS setup and enabled the WLAN.
Finally, when the laptop turned on, everything was working fine again.

Answer 2

In my case I installed ubuntu 20.04 and wifi was not working, message was same as "No wifi adaptor found".
I had onboard wifi adaptor.
Using command sudo lshw -C network, I got
*-network
description: Wireless interface
product: Wi-Fi 6 AX200
vendor: Intel Corporation
I knew that my wifi adaptor is of Intel® and now I found that Wi-Fi 6 AX200 160MHz is the actual adaptor.
After doing hours of googling, I went on intel official site and found this link Linux* Support for Intel® Wireless Adapters
I found that my adaptor was listed there under Intel® Wi-Fi 6 AX200 160MHz
I downloaded iwlwifi-cc-46.3cfab8da.0.tgz and extracted it under the directory /lib/firmware as mentioned on intel site.
wooooooooooooo, ubuntu was able to detect the adaptor and my wifi connections were listed under wifi settings.
You may need to restart the system, though in my case it worked as soon as I extracted the files in /lib/firmware.