(tl;dr) My USB 3.0 ethernet adapter is found (lsusb), but the Ethernet interface is disabled after every reboot in Ubuntu 18.04 beta 2, even if I enable it with ip or ifconfig command (funny: it's found during installation and even connects, via dhcp, but is disabled after first reboot).
Long version: I am trying to get a DELOCK 62966 USB 3.0 > 4x Ethernet Adapter to work in a Ubuntu machine. Important: Ubuntu runs as VM in the latest Virtualbox, with a USB filter allowing access from the VM. It works well in a parallel running Windows VM. I also tried a different adapter (Lenovo Thinkpad USB 3.0 Ethernet adapter).
sudo lshw -C network gives the following result:
*-network DISABLED
description: Ethernet interface
physical id: 1
logical name: enx00e04c6801e1
[...]
I tried solutions from multiple forums from the past 10 years, e.g.:
sudo ip link set enx00e04c6801e1 up
sudo ip l s dev enx00e04c6801e1 up
This resulted in sudo lshw -C network not showing "DISABLED" anymore, but ifconfig shows that the interface does not have a valid IP. So I used sudo dhclient enx00e04c6801e1. Then, finally it showed a valid IP address.
Fyi, my /etc/network/interfaces was completely empty. I tried adding the following lines but they did not make any difference (I tried/rebooted multiple times)
auto lo
iface lo inet loopback
auto enx00e04c6801e1
iface enx00e04c6801e1 inet dhcp
Do I have to add all these steps in a script which starts at boot (if so how?) or is there a simple solution to tell ubuntu to use the adapter every time I boot?
Thank you for your help!!
UPDATE 1:
Here's the result of cat /etc/netplan/*.yaml:
# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
ethernets:
enp0s3:
addresses: []
dhcp4: true
version: 2
-> means I need to add the enx... as well?