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QUESTION UPDATED

I have a dual boot with Ubuntu 18.04 and Windows 10. Wifi was working fine until two days ago, and it stopped working for no apparent reason. Wifi in Windows 10 is working fine.

There has been some developments in the question above and the problem itself changed. In my Asus Zenbook, I had originally disabled Secure Boot, but when this problem started to happen I realised that it was enabled again. As mentioned in the previous question the behaviour of Ubuntu recognising the card was quite erratic. However, there was in the BIOS an option called Secure boot control which was enabled. I don't know what it means, but I disabled it and the erratic behaviour disappeared.

Since then, the wifi adapter is still not working, but lshw always gives the following message:

sudo lshw -c network
  *-network UNCLAIMED       
       description: Network controller
       product: Wireless 8260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 3a
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress cap_list
       configuration: latency=0
       resources: memory:ef000000-ef001fff

Other commands:

lspci -nnk | grep 0280 -A3
02:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
    Subsystem: Intel Corporation Wireless 8260 [8086:0110]
    Kernel modules: iwlwifi

sudo modprobe iwlwifi && dmesg | grep iwl
[    3.626468] iwlwifi 0000:02:00.0: Refused to change power state, currently in D3
[    3.626772] iwlwifi 0000:02:00.0: HW_REV=0xFFFFFFFF, PCI issues?
[    3.651088] iwlwifi: probe of 0000:02:00.0 failed with error -5

sudo rfkill list all
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

sudo modinfo iwlwifi | grep 24F3 | grep 0050
alias:          pci:v00008086d000024F3sv*sd00000050bc*sc*i*

I have the following kernel, updated yesterday (Ubuntu is 18.04.4):

uname -a
Linux arbexzen 5.3.0-62-generic #56~18.04.1-Ubuntu SMP Wed Jun 24 16:17:03 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
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    "sudo apt install --reinstall bcmwl-kernel-source" That's a driver for a Broadcom wireless device. It is not relevant at all for an Intel. – chili555 Jul 7 '20 at 16:33
  • Thanks, sorry for that, I was trying everything – Chicoscience Jul 7 '20 at 16:37
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    I would try: sudo apt purge bcmwl-kernel-source; reboot and see if there is any improvement. I am a bit skeptical, but please try it for completeness. – chili555 Jul 7 '20 at 17:00
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    Is the behavior changed if you cold boot into Ubuntu vs. reboot from Windows to Ubuntu? – chili555 Jul 7 '20 at 20:09
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    I'm very puzzled that it sometimes appears on PCI bus 0000:02:00.0 and sometimes on bus 0000:00:1c.6 as seen in your dmesg above. Are there any clues here: dmesg | grep 02:00 or else: dmesg | grep 1c.6 As the output may be lengthy, paste the result here and give me the link: paste.ubuntu.com – chili555 Jul 7 '20 at 21:35
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In the end, it was a hardware issue.

I sent the laptop to the shop for a checkup and internal cleanup and they found that the wifi adapter connector was slightly off. Windows was still able to establish the connection, but Ubuntu wasn't. This also explains why sometimes the adapter was detected, but unclaimed, and why sometimes it wasn't detected at all.

So, for everyone experiencing similar problems, a wifi adapter working in Windows but not in Ubuntu may still be a hardware issue.

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