FIXED. su - worked a treat and I'm now looking at the Debian home page
on the Linux box.
I got some odd messages from dpkg about possible missing firmware in
/lib/firmware/nvidia/gp108/.... mostly for "module nouveau".
so presumably my graphics card. I've not noticed any problems with the
graphics but I've yet to use it much. We'll see.
Thanks to Greg and Curt for the info about su - and Gene for the correct
syntax for checking a PATH.
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