[Post-Install] Kubuntu 26.04 Network device not working/showing after update or reboot

[cherryForge]

hi

I installed Kubuntu 26.04 and everything worked nice. Internet connection was working, i did updates and after that Internet connection stopped working and my network device is not shown in system manager.
After a fresh install everything was working nice again. I did run the updates again to check which one is causing the problem. But this time my network worked until the next reboot. After first reboot device is not shown/recognized again and no internet connection.

I tried commands, that helped others to fix network connection, but nothing worked with kubuntu.

What can I try to fix this? Which update is causing this and how to remove it?

Thank You

[die.boer]

are you dual booting with windows?
how do you connect , wifi or ethernet or USB adapter?
don't know what commands you tried , so ...please post output of these commands.

lspci -nnk | grep -A5 -iE "network|ethernet|wireless"

lspci -nnk

uname -r

another test to try is to boot the previous kernel from GRUB:
Hold Shift (BIOS) or Esc (UEFI) during boot.
Choose Advanced options for Kubuntu.
Select the older kernel.

[kc1di]

We will need a bit more info to be of much help post the outputs of the command requested by die.boer and also the output of

rfkill list

Also give use as much info about the machine as you can.

[die.boer]

Also give use as much info about the machine as you can.

can use

inxi -Fazxx

(or can copy/paste this in terminal )


echo "===== SYSTEM ====="
uname -a
echo

echo "===== OS ====="
cat /etc/os-release
echo

echo "===== CPU ====="
lscpu
echo

echo "===== MEMORY ====="
free -h
echo

echo "===== PCI DEVICES ====="
lspci -nnk
echo

echo "===== USB DEVICES ====="
lsusb
echo

echo "===== DISKS ====="
lsblk