Thanks to all who replied to my post.
Unfortunately, any version of TDE in my new laptop has in many places
been unable to make an online connection.  It may be due to lack of
drivers or firmware.  So for now I'm running Linux Mint (Debian Mate)
with some Trinity apps and will have a go at this some time later.
BTW, "Mate" refers to the Yerba Mat� drink, not the British "matey".

Robert