this is what I found in the log by running the following command:
grep -i networkmanager /var/log/syslog | tail -n2May 16 14:26:52 a9da3777f4a1 NetworkManager[930]: Auto-activating connection 'Wired connection 1'. May 16 14:26:52 a9da3777f4a1 NetworkManager[930]: Connection 'Wired connection 1' auto-activation failed: (2) Device not managed by NetworkManager or unavailable
It doesn't seem to give any useful information. I'll try disabling the auto-activation option and see if that helps.
