When you open The Network (Red) preference pane, click on the icon with the 3 x ... and down arrow.
View attachment 558432
This will bring up a sub-menu, from which you should select the 'Add Service' option.
View attachment 558433 Select 'Add Service...'
Then from the next window select Interface up/down arrows.
View attachment 558434 as shown in this example
From the window that appears select 'Ethernet', to create a new Ethernet Interface, as your system currently lacks one.
View attachment 558435 as Shown in this example.
Name the new Interface as Ethernet.
See if this allows you to create an Ethernet Interface on your Hack.