Intel Wifi Card not working on Ubuntu

I've tried just about everything there is to try and I still can't seem to get my Wi-Fi card working.

I've got a Dell Vostro 14 5490 laptop.

It appears that I don't have a working driver for my card or something along those lines. The Wi-Fi menu in the setting GUI says "No Wi-Fi Adapter Found".

Though, I know there is one and it functions perfectly because I have Windows installed in dual-boot and it works fine on it. I have verified there is no switch on the laptop and the setting is on in the BIOS.

Also, I found this link to some drivers for intel wireless cards for linux. I wasn't sure which, if any of these would work for my card. I've just installed the iwlwifi-9000-pu-b0-jf-b0-34.618819.0.tgz and the iwlwifi-9260-th-b0-jf-b0-34.618819.0.tgz drivers. (I'm also not certain if my process in installing these was correct either; all I did was downloaded them and move them to /lib/firmware/ and then unzipped them there. Leaving the zip files and everything in the directory) I did not have any luck in doing this - I even tried restarting the computer.

$ lspci -nn | grep -i network
Network Controller [0280]: Intel Corporation Device [8086:02f0]

$ uname -r
5.0.0-31-generic

$ iwconfig
enp2s0    no wireless extensions.
lo    no wireless extionsions

$ sudo lshw -C network
*-network
    description: Network controller
    product: Intel Corporation
    vendor: Intel Corporation
    physical id: 14.3
    version: 00
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress msix bus_master cap_list
    configuration: driver=iwlwifi latency=0
    resources: irq:16 memory:cc22a0000-c22a3fff

$ dmesg | grep -i firm
[    0.204901] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[    1.233739] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[    1.364414] [Firmware Bug]: ACPI(PXSX) defines _DOD but not _DOS
[   20.643192] iwlwifi 0000:00:14.3: loaded firmware version 43.95eb4e97.0 op_mode iwlmvm
[   21.051100] Bluetooth: hci0: Firmware revision 0.0 build 26 week 21 2019
[   26.210254] iwlwifi 0000:00:14.3: Failed to load firmware chunk!

$ sudo dpkg -s linux-firmware | grep Ver
Version: 1.178.3

After running the linux-firmware update as per the answer below by chili555, I ran the following and got the following output:

$ dmesg | grep iwl

Since the output was so huge, I put it into this pastebin: https://pastebin.com/M9eFfqxd

Also, during the linux-firmware update, I got a couple informational prints that said:

I: The initramfs will attempt to resume from /dev/dm-2
I: (/dev/mapper/ubuntu--vg-swap_1)
I: Set the RESUME variable to override this.

After running the second set of commands in the answer below by chili555, I received the following output:

$ dmesg | grep iwl

Again, due to the output being so massive, I've included it in this pastebin: https://pastebin.com/QH8zPmgL

The wifi functionality now appears to be working properly subsequent to running the commands in chili555's answer.

I believe that your device uses the Qu- and Quz-series of firmware blobs, not the 9000- or 9260-series; reference: https://bugs.launchpad.net/hwe-next/+bug/1833065 at comment #4. I believe that the later linux-firmware version 1.183 contains the referenced 48.xx versions. Please install it:

wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.183_all.deb
sudo dpkg -i linux*.deb

Reboot and show us:

dmesg | grep iwl

EDIT: The referenced bug report further suggests that the bug is fixed in the package linux-oem-osp1. Please install it:

sudo apt update
sudo apt install linux-oem-osp1

Several dependencies will also be installed.

Reboot and show us a new:

dmesg | grep iwl