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...)
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:~$sudo lshw -C network | grep logical
When I run that command same outcome as command above: it flashes "PCI (sysfs)" real quickly & disappears and then flashes "USB" real quickly & disappears and then returns to the command prompt of m1@m1-sesktop:~$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.sudo cat /etc/network/interfaces
Returns these three lines:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
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