I recently updated Ubuntu from 20.04.1 LTS to 22.04.1 LTS and since I experience very unstable wifi connection on my Lenovo T460 with a wireless adapter Intel Wireless 8260

I have also I have a Windows 10 dual boot. fast startup is disabled.

Sometime when I startup Ubuntu, no wifi adapter is found at all. A few restarts could make it available again, with kernel or using the previous available kernel version 5.15.0-46-generic Now it is never available.

Additional info

Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev ff) Kernel driver in use: iwlwifi Kernel modules: iwlwifi

sudo dpkg -s linux-firmware | grep -i version Version: 20220329.git681281e4-0ubuntu3.5

sudo modprobe iwlwifi: Displays nothing

sudo dmesg | grep iwl: Displays nothing

dkms status: Displays nothing

I have tried below, as suggested in a similar issue, but it did not help

sudo mv /usr/lib/firmware/iwlwifi-ty-a0-gf-a0.pnvm /usr/lib/firmware/iwlwifi-ty-a0-gf-a0.bak

Remaining pnvm files below as been also moved to .bak files ls /usr/lib/firmware | grep -i pnvm iwlwifi-so-a0-gf4-a0.pnvm iwlwifi-so-a0-gf-a0.pnvm

Any help is welcome as I am not familiar at all with Linux driver issues


  • Fast Boot, a firmware (UEFI feature, is NOT the problem. Fast Startup, a Windows feature can be. When dual-booting with Windows disabling it is a must. Oct 13, 2022 at 18:57
  • Thanks for the clarification. I mean Windows fast startup. It is disabled yes. Qurestion edited Oct 13, 2022 at 19:24
  • So driver file is iwlwifi-8000C-13.ucode and is well present in firmware folder. But what are pnvm files? Oct 13, 2022 at 19:42
  • Tried to check Wifi from Windows and now not available also from there. Bluetoth also unavailable from Ubuntu now. Maybe the Wireless card is dead? How can I ensure that? Oct 14, 2022 at 10:47

1 Answer 1


Ok seems it was an hardware issue.

After changing adapter Intel Corporation Wireless 8260 by a brand new one (Intel Corporation Wireless 9260), Wifi and Bluetooth are now back to normal without any other config change

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