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This brings up the question is why in the world is ethtool not included in the
LinuxCNC distribution (plus the RT8168 DKMS driver should be as well)

These affect all LinuxCNC Ethernet connected motion devices, not just Mesa

Find a USB-wireless dongle and connect to internet.

ip a
 

My computer is not connected to the internet and has no wifi should I connect to the internet and try again? I used a cable to do the installation and then I disconnected it to connect the 7i76e.

Yes, looks like you have no network connectivity.

What does

ip a

report

On your screenshot, it clearly states to do
sudo apt-get update
and try again
Although, this being a networking issue, i have to ask:
-how is the PC wired to internet?
-If wired through cable, did you revert back the network settings?

 

OK so ethtool is not installed

sudo apt-get install ethtool

 

 

RMJ wrote:

please let me know where to find instructions on how to start a cut in the middle of the file so at least cut recovery is simpler. 

 

  Run From Line allows starting from almost anywhere in a cut file.

Try

locate ethtool

to see if its installed

if it is found, you may need to give the complete path

if it's not installed you will need to install ethtool

sudo apt-get install ethtool

I got a command not found
 

OK that's Intel so needs IRQ coalescing disabled

Before messing with the network setup its possible
to do this from the command line:

sudo ethtool -C [device] rx-usecs 0

where [device] is the name of the Ethernet device connected
to the Mesa card (usually something like eno1 or enp2s5 or similar)

You can determine this name with the command:

ip a

 

 

lspci  | grep -i eth

The character after lspci is a vertical bar
( usually shift \ ), not an 'L'