Hi, I'm the one who created the post on AskUbuntu. In the certification, it appears that the Latitude 5420 is equipped with Intel I219-V ethernet cards, but this is not the case on ours, which are equipped with Intel I219-LM cards, maybe it's a clue?
Here is the kernels I've tested : - 5.8.0-43-generic (fresh install from Ubuntu 20.04.2 iso) - 5.8.0-55-generic (upgrade from Ubuntu 20.04.2 iso) - 5.6.0-1032-oem (fresh install from Dell 20.04.1 iso) - 5.10.0-1029-oem (upgrade from Dell 20.04.1 iso) - 5.11.0-16-generic (fresh install from Ubuntu 21.04 iso) - 5.11.0-18-generic (upgrade from Ubuntu 21.04 iso) Also, I try to force the installation of the last e1000e drivers (v3.8.4) both on a fresh install from Ubuntu 20.04.2 iso and Dell 20.04.1 iso but the problem still here. And, today I tried to modify the GRUB but nothing change, always this slow ethernet... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1930754 Title: e1000e extremly slow To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-oem-5.10/+bug/1930754/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs