Quote from: Doftorul on March 05, 2018, 11:16:44 AM

Quote from: mudball on March 05, 2018, 01:09:26 AM

Putting all my responses in RED and in one reply (working from nvOC in LOCAL mode so not able to copy-and-paste results, so I'm slow...)

Quote from: Doftorul on March 04, 2018, 11:52:07 PM

In order to be able to help you a bit, try to run the following command:

sudo lshw -C network

When I run that command, it flashes "PCI (sysfs)" real quickly & disappears and then flashes "USB" real quickly & disappears and then returns to the command prompt of m1@m1-sesktop:~$

Quote from: Doftorul on March 04, 2018, 11:52:07 PM

sudo lshw -C network | grep logical

When I run that command same outcome as command above: it flashes "PCI (sysfs)" real quickly & disappears and then flashes "USB" real quickly & disappears and then returns to the command prompt of m1@m1-sesktop:~$

Quote from: Doftorul on March 04, 2018, 11:52:07 PM

For some even more debug options, the result of the following commands will give us a hint on the potential driver/modules issues:

sudo lspci -nnk | grep -iA2 eth

This does nothing other than return to the command prompt.

Quote from: Doftorul on March 04, 2018, 11:52:07 PM

sudo cat /etc/network/interfaces

Returns these three lines:
# interfaces(5) file used by ifup( Cool

and ifdown( Cool

auto lo
iface lo inet loopback

Quote from: Doftorul on March 04, 2018, 11:52:07 PM

You can always try to re-initialize the network-manager using this command:

sudo dpkg-reconfigure network-manager

I get the following message: insserv: warning: script 'gpu' missing LSB tags and overrides

Then I used: sudo service network-manager restart
That showed a graphical message that said I was now disconnected and off-line (which is interesting since I wasn't on-line to begin with

Try this and get back with the output:

lspci -nnk | grep 0200 -A3

There seems to be a issue with the hardware if the lspci and lshw are returning naught...

Being a Gigabyte mobo, known for their hairy implementations of the Realtek to ICH bridging, it might help also to update your BIOS:

https://www.gigabyte.com/MicroSite/462/images/BIOS-Z270P-D3.zip

NOTE: Please check the HW revision of your mobo before trying to update. This is a "mining" optimised BIOS

I've seen something similar a while back with a rev. 1 board, similar to yours, that was running out of lanes for peripherals and the loading of the PHY drivers for ethernet and usb were loaded erratically at times.

The lspci command returned nothing (just went back to command prompt). And the BIOS you linked to is the one I've been using.

I have two other of the brand new mobo's. Maybe best next step is to start over with a new mobo to see if I can either get it to work or, at a minimum, identify where it is in the process I'm using that the LAN controller becomes unrecognized?