BETA-33 wrote:

I have a house with 2-wire receptacles. From one of the 2-wire receptacles,
I want to run a line to a new 2-wire receptacle that I am adding. The wire
I have to run the line is 12/2.

The question I have is, "What do I do with the bare ground wire in the 12/2
wire?"

The original 2-wire receptacle box and the new 2-wire receptacle box are
metal. I am assuming that I should NOT connect the bare ground wire to the
metal box on either end.

Is that correct, or am I supposed to attach the bare ground wire to each
metal receptacle box even though I don't know if either box is grounded?

Thanks.

Check to see if the original metal box is grounded. The cheap little
plug in testers will do the job. Depending on the age of the house you
might have the early romex with ground and the metal boxes are grounded,
but ungrounded receptacles were used. If that's the case you can convert
to grounded receptacles with relative ease.