Thank you all for your guidance.
Yes, it was just an access problem. Using
sudo python3 ~/Electrum-3.3.5/run_electrum
it works.
I have also
sudo chmod 770 /home/richard/.electrum/daemon
This does not appear to change anything. I still need
sudo python3 ~/Electrum-3.3.5/run_electrum
to get Electrum to run.