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After updating the kernel to 5.8.0-36-generic and rebooting I noticed the network wasn't working.

Using the previous working kernel I've found that the problem was related to drivers not present because my interfaces were UNCLAIMED using lshw -c network.

I've found other posts suggesting to install the linux-generic-hwe in my case linux-generic-hwe-20.04.

After installing it the interfaces where recognized.

I can't quite get what happened, and probably don't quite know where to look for information about this, the previous kernel worked fine. I don't understand if the driver was removed between kernel releases or something else..

The output of sudo lshw -c network with the network working is pasted here:

  *-network
       description: Wireless interface
       product: Dual Band Wireless-AC 3168NGW [Stone Peak]
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlp3s0
       version: 10
       serial: 60:f6:77:65:e5:69
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.8.0-36-generic firmware=29.1654887522.0 3168-29.ucode ip=192.168.1.9 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:128 memory:df100000-df101fff

So it looks is something related to iwlwifi.

Anybody can give any info regarding this, the update process finished with no errors, so I guess it's something else.

Mauro Scomparin
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  • While booted into 5.8.0-36-generic, please run the terminal command: sudo modprobe iwlwifi && dmesg | grep iwl Next, edit your question to show the result. Welcome to Ask Ubuntu. – chili555 Jan 12 '21 at 21:16
  • Are you asking about a wireless "network"? – Pilot6 Jan 13 '21 at 09:41
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    Thank you so much for that tip about installing linux-generic-hwe. I was having the same issue and that solved it for me. And @chili555, running sudo modprobe iwlwifi without having that packaged installed returned an error (could not find module and missing symbol, I won't past it here to avoid polluting the comments). – andreibosco Jan 20 '21 at 17:19
  • @chili555 I'm sorry, after installing the hwe kernel the problem went away, so I can't try that. – Mauro Scomparin Jan 21 '21 at 07:42
  • @Pilot6 I used a wireless adapter to connect, but the wired interface was down too. From what i remember the wired one was down too before updating the kernel. – Mauro Scomparin Jan 21 '21 at 07:44

4 Answers4

8

Also lost network connection after updating from kernel 5.4.0 to kernel 5.8.0-41.

Looking at the output of

dpkg -l | grep linux-

I figured out that in my case the previous kernels had linux-modules-extra- packages installed, but linux-modules-extra-5.8.0-41-generic was missing. After booting a 5.4.0 kernel (with working network connection) I could fix the problem by

sudo apt install linux-modules-extra-5.8.0-41-generic
Jörg Mische
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  • Exactly the same here, any idea how this came about? – Ozone Feb 09 '21 at 09:04
  • It worked for me! Thx a lot!! – Cainã Max Couto da Silva Jun 25 '21 at 19:00
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    @ozone one possibility is that the wrong architecture was selected/ detected? I have been researching it a bit, and it seems like this module is only included in the x64 variant. All of the other packages (i.e. the headers, image, etc. come packed for x86 & x64.) This is just a guess. I'm still trying to figure it out myself. Anyone else have any ideas? – Nate T Aug 02 '21 at 03:32
  • My old kernel does not have extras installed either. – 2017561-1 Apr 01 '23 at 20:44
  • thank you! this solved my network issue after updating my kernel. – jsibs Feb 19 '24 at 18:29
5

I was also facing a similar problem with the wireless network and the touchpad not working after upgrading to 5.8 kernel.

I found this question.

After running

dpkg -l | grep linux-

I found that the modules for linux-modules-5.8.0-38-generic wasn't installed but the previous kernel's modules were.

So if you can connect to a wired network, doing

sudo apt-get install linux-modules-5.8.0-38-generic linux-headers-5.8.0-38-generic

should install them. That seemed to work for me.

If you are like me, who cant connect to wired network, try switching the kernel in the grub ' Advanced options for Ubuntu ' to a previous working version of the kernel, and try installing the above.

Harish Ganesan
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  • I guess installing the hwe version of the kernel installed the modules too? I had to switch kernel to the previous version in grub to update. – Mauro Scomparin Jan 21 '21 at 07:37
  • Yeah must have been. For the modules, i also had to install the headers, but not all the headers were retreived for some reason. – Harish Ganesan Jan 21 '21 at 09:17
  • I think you may have forgot the word "extras". The 'extras' package is the hardware enablement (hwe) package. Without thes packages, I doubt the system would boot. This is almost the entire kernel. – Nate T Aug 02 '21 at 03:41
  • I think extras was already installed. I was able to boot to GUI. I just wasnt getting Wifi. Those must have been part of different packages. – Harish Ganesan Aug 03 '21 at 06:16
2

I had the same issue when I updated to 5.8.0-63 kernel. My wifi, sound and graphics were messed up.

Following the answers by Jörg and Harish above, I booted into an older kernel with working internet from the Ubuntu advanced options in the boot menu and ran the following command

dpkg -l | grep linux-

I installed the 2 packages: headers and extra, that were missing for the newest kernel.

sudo apt install linux-modules-extra-5.8.0-63-generic linux-headers-5.8.0-63-generic

After reboot, everything works perfectly again.

linuxn00b
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1

I installed all the packages below solved my network and brightness issue:
Replace version 5.13.0-25 to your_version.

sudo apt-get install linux-image-5.13.0-25-generic linux-headers-5.13.0-25-generic linux-modules-5.13.0-25-generic linux-modules-extra-5.13.0-25-generic linux-hwe-5.13-headers-5.13.0-25
habibun
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