Thanks Carpentry, I followed your instructions exactly and everything worked, but when I restarted there was still no Ethernet connectivity available (see attached pic).
At least there were no kernel panics on restart!
So, am I looking at the correct system window (Network) to check for Ethernet connectivity (see pic)?
View attachment 94381
And just in case... here's a pic of the Ethernet cable connection (note that the lights aren't even on, let alone blinking).
View attachment 94382
By the way, I'm not too worried about the audio since my speakers are USB-connected.