I am having similar problems with Dell Optiplex 7060 running Ubuntu 18.04.2. I think the problem is connected with the chipset they are using since other machines are fine.
The network is extremely slow with the e1000e module provided by Ubuntu (3.2.6-k). Compiling the latest driver from Intel solves this, but I can not maintain this as a solution across all the clients. # inxi -Nxxx Network: Card: Intel Ethernet Connection (7) I219-LM driver: e1000e v: 3.2.6-k bus-ID: 00:1f.6 chip-ID: 8086:15bb # speedtest Testing download speed................................................................................ Download: 0.07 Mbit/s Testing upload speed...................................................................................................... Upload: 488.32 Mbit/s # inxi -Nxxx Network: Card: Intel Ethernet Connection (7) I219-LM driver: e1000e v: 3.4.2.1-NAPI bus-ID: 00:1f.6 chip-ID: 8086:15bb # speedtest Testing download speed................................................................................ Download: 592.69 Mbit/s Testing upload speed...................................................................................................... Upload: 633.40 Mbit/s -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1785171 Title: Intel I219-V Ethernet Interface on Ubuntu Linux Using e1000e Driver keeps Dropping Internet Connection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785171/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs