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I've got a Dell Precision T5810 that is dual booting Windows 10 and Xubuntu 14.04. I know 14.04 is EOL but some software requires 14.04 still *cough* medical software *cough*. Xubuntu is the default option in Grub so when rebooting from Windows 10 the PC will reboot to Xubuntu. When this happens the NIC cannot communicate out the NIC port. If the PC is shutdown from Windows 10 and started backup into Xubuntu the NIC has no problems. Dell is hesitant to support anything related to Xubuntu since the workstation shipped with Windows 7.

I do see dhcpd sending out broadcast packets to get an IP but nothing is seen on the dhcp server in my router. There are link lights and flashes indicating traffic on the switchport and the NIC port on the workstation. I can ping 127.0.0.1

Dell's pre-boot diagnostics will fail the NIC if I reboot from Windows 10 into Xubuntu 14.04 then reboot and go directly to the pre-boot diagnostics. If I reboot Windows 10 and enter pre-boot diagnostics the NIC passes.

There are not differences in lsmod or dmesg for the networking between reboots when the NIC works and when it doesn't.

This issue is specific to the Dell Precision T5810. We have deployed dozens of T7810s and T7820s without an issue.

I can provide any necessary info needed if anyone can point me in the right direction.

Thank you
10-15-2020, 03:13 PM
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