Problem

My wifi connection works fine, but Ethernet (plugged with a USB cable) does not work. It works fine on Windows.

What I've tried

I tried installing the r8168 driver, reboot. But it did not help. I tried sudo dhclient, did not help too. I tried understanding how all these network issues are dealt with in Ubuntu, but could not manage...

Information

From what I saw on other questions, those outputs might be useful:

Hardware

sudo lshw -C network *-network description: Wireless interface product: Wireless 8265 / 8275 vendor: Intel Corporation physical id: 0 bus info: pci@0000:01:00.0 logical name: wlp1s0 version: 78 serial: 00:28:f8:15:08:e7 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlwifi driverversion=5.8.0-48-generic firmware=36.77d01142.0 8265-36.ucode ip=192.168.43.36 latency=0 link=yes multicast=yes wireless=IEEE 802.11 resources: irq:144 memory:dc100000-dc101fff *-network DISABLED description: Ethernet interface physical id: 2 bus info: usb@1:1 logical name: enx9cebe808f9c6 serial: 9c:eb:e8:08:f9:c6 size: 100Mbit/s capacity: 100Mbit/s capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=asix driverversion=22-Dec-2011 duplex=full firmware=ASIX AX88772B USB 2.0 Ethernet link=no multicast=yes port=MII speed=100Mbit/s

ifconfig

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: wlp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:28:f8:15:08:e7 brd ff:ff:ff:ff:ff:ff inet 192.168.43.36/24 brd 192.168.43.255 scope global dynamic noprefixroute wlp1s0 valid_lft 2552sec preferred_lft 2552sec inet6 fe80::a031:3a29:4430:c215/64 scope link noprefixroute valid_lft forever preferred_lft forever
6: enx9cebe808f9c6: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether 9c:eb:e8:08:f9:c6 brd ff:ff:ff:ff:ff:ff

Netplan

cat /etc/netplan/01-network-manager-all.yaml
# Let NetworkManager manage all devices on this system
network: version: 2 renderer: NetworkManager

Sorry if the information is misleading or not useful, but as I mentioned earlier, I have little knowledge of what I'm doing. Again, the connection works fine on windows with the same machine, so I'm expecting a driver issue. Finally, no ethernet information appear in the "Network" settings.

Any comment or direction would be really appreciated. Thanks a lot for your time !

1 Answer

Ok, after spending another hour deciphering all these issues I found a solution. First, I changed etc/NetworkManager/NetworkManager.conf:

managed=true

Credits to the answer here.

The *-network DISABLED is due to the ethernet cable not being found, and can be corrected by editing /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf:

unmanaged-devices=*,except:type:ethernet,except:type:wifi,except:type:wwan

Credits to this.

A bit confused how complicated it was for a layman to fix these issues. I guess it's trivial to track down when we know how all the processes for network connections are handled by Ubuntu, but that was clearly not my case. Hope that helps though.