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I'm fairly new to Ubuntu and Linux in general. I'm using a Dell XPS 13" 7390 that shipped with 18.04 already installed. Upgraded from 18.04 to 19.10 through the GUI prompt, and after rebooting I no longer have Wi-Fi.

Here is the output of lspci -knn | grep Net -A3:

55:02:00.0 Network controller [0280]: Intel Corporation Device [8086:2723] (rev 1a)
56: Subsystem: Bigfoot Networks, Inc. Device [1a56:1653]
57- Kernel modules: iwlwifi
58-03:00.0 PCI bridge [0604]: Intel Corporation JHL6540 Thunderbolt 3 Bridge (C step) [Alpine Ridge 4C 2016] [8086:15d3] (rev 02)
59- Kernel driver in use: pcieport

And this is the output of rfkill list:

0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

I also tried disabling 802.11n, but that didn't help.

Any help is appreciated!

Edits, with additional commands tried:

sudo modprobe iwlwifi fails with the message modprobe: ERROR: could not insert 'iwlwifi': Exec format error. Adding the --force flag doesn't change that.

uname -r (this is the Linux kernel version, right?) outputs/returns 4.15.0-1081-oem.

modinfo iwlwifi | grep filename prints filename: /lib/modules/4.15.0-1081-oem/updates/dkms/iwlwifi.ko.

sudo dpkg -s backport-iwlwifi-dkms outputs this: 

Package: backport-iwlwifi-dkms
Status: install ok installed
Priority: optional
Section: kernel
Installed-Size: 9599
Maintainer: Ubuntu Developers <[email protected]>
Architecture: all
Version: 7906-0ubuntu4
Provides: iwlwifi-modules
Depends: dkms (>= 2.1.0.0), libc6-dev | libc-dev
Description: iwlwifi driver backport in DKMS format
 Intel works with periodic releases of the iwlwifi driver that are
 tested with a specific combination of components such as firmware and
 hostap. These releases can be seen as snapshots of the development
 trees (including upstream) that can be used on older kernels.
 .
 This package provides iwlwifi modules built from iwlwifi-public
 defconfig based on upstream master branch.
Original-Maintainer: You-Sheng Yang <[email protected]>
Homepage: https://gitlab.com/vicamo/backport-iwlwifi-dkms
Modaliases: cfg80211(net-pf-16-proto-16-family-nl80211), iwlwifi(pci:v00008086d00007AF0sv*sd00000A10bc*sc*i*,

The Modaliases: stuff continues for quite a while (total file size was around 32kb).

dmesg | grep iwl doesn't print anything either.

Improve this question
7
  • Please edit your question to show the result of the terminal command: sudo modprobe iwlwifi && dmesg | grep iwl Welcome to Ask Ubuntu.
    – chili555
    May 30, 2020 at 1:23
  • @chili555 Updated. sudo modprobe iwlwifi fails.
    – Eric Fulmer
    May 30, 2020 at 1:33
  • 1
    Very interesting! Please also show, in an edit, uname -r as well as: modinfo iwlwifi | grep filename
    – chili555
    May 30, 2020 at 15:27
  • Thanks! I've added what the laptop prints out from both of those comments.
    – Eric Fulmer
    May 30, 2020 at 18:37
  • 1
    Please also show us: sudo dpkg -s backport-iwlwifi-dkms I suspect that it is installed and that we should remove it.
    – chili555
    May 30, 2020 at 19:54

1 Answer 1

Reset to default
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I suggest that you try removing the backport package.

sudo apt purge backport-iwlwifi-dkms

Reboot.

Any improvement?

Improve this answer
7
  • After removing the package and rebooting, the settings still report that there's no wi-fi adapter.
    – Eric Fulmer
    May 30, 2020 at 23:10
  • Please show us: dmesg | grep iwl
    – chili555
    May 31, 2020 at 0:12
  • No output; added this to the question.
    – Eric Fulmer
    May 31, 2020 at 0:36
  • How about: sudo modprobe iwlwifi and then: dmesg | grep iwl
    – chili555
    May 31, 2020 at 0:46
  • That grep also gives nothing, even with --force added for modprobe.
    – Eric Fulmer
    May 31, 2020 at 0:51

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