Sorry for my late response to this thread. I lost the connecting thread
and now something weird has happened to the pane layout in my Pan news
reader.

Anyway, many thanks to Mike Easter (Apologies for the vague specification
of my system), Jonathan Little and Henry Crun. I followed Henry's
instructions to the letter and it all worked very well.

One peculiarity of my system is that there is no eth0 but there is a
enp4s0 instead. I think this was at the root of my problems in trying to
follow instructions on the net.

Just two remaining problems.

1) I don't seem to be able to restart network-manager.service but this
doesn't affect my ability to access the network so it is of low priority.

2) Unconnected to networking. Why has Pan changed the pane layout and
provided no means to recover that I can see?

Best Regards and thanks again,
Jack Fearnley