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I have an Alienware laptop with the Qualcomm Atheros Killer E2500 LAN adapter which worked always until after upgrading to Ubuntu 20.04, when it stopped working completly. I'm on the newest kernel 5.8.0-53 and linux-generic-hwe-20.04 is installed, the ethernet hardware is detected but not working.

sudo lshw -c network for this device shows:

*-network DISABLED

If I enter sudo ifconfig enp61s0 up it supposedly starts (the DISABLED flag vanishes) but the ethernet is still not working. The network manager GUI does not show any ethernet related options. After rebooting it is set to DISABLED again.

How do I get this ethernet adapter working again?

(the WLAN, also from Qualcomm Atheros, is working perfectly fine)

Foo Bar
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1 Answers1

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I found it randomly by starting to looking into NetworkManager, was not actually any driver-related problem:

https://askubuntu.com/a/893614/341343

sudo touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf
sudo service network-manager restart

This empty file was missing for some unknown reason. I don't know why a missing empty file with such starnge name prevents NetworkManager to work properly, however. Sounds like a bug to me.

Foo Bar
  • 167