I might have the same issue, I'm not sure. I have a Ubuntu 19.04 server with an onboard e1000e interface and a usb ax88179_178a interface, routing traffic between the two.
The e1000e interface drops a couple of times a day and I see "Detected Hardware Unit Hang" / "Reset adapter unexpectedly" messages in syslog. I don't know what triggers that, there's no significant traffic in my graphs. I can trigger the e1000e to drop reliably, but the trigger doesn't make sense: I can send as much traffic as I want from ax88179_178a through e1000e and vice versa. I can send as much traffic as I want to the server itself from the e1000e. If I send any moderate amount of traffic to the server from the ax88179_178a, then the e1000e drops. For example, apt- get will cause the e1000e to drop. The server is fine, the ax88179_178a is fine, the apt-get or wget or whatever will complete and eventually my TCP session will usually recover after the e1000e resets. If the files are large enough, this may happen several times. It doesn't seem to matter if it's writing to disk or to /dev/null. I have swapped out the switch, the cable, and the USB ethernet interface (both for another ax88179_178a and some other chipset I don't remember.) I have tried kernels from the mainline ppa. I have tried every combination of ethtool knob-twiddling. No luck. The issue first appeared for me after upgrading from 18.04. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1832101 Title: systemd-networkd: Lost carrier e1000 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832101/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
