Hi. These commands worked allowing desktop to print by network after my phone started to also connect to the Canon.
sudo ufw allow from 192.168.1.0/24 to 127.0.0.1 port 631
sudo ufw allow from 127.0.0.1 port 631 to 192.168.1.0/24
There is another command I was advised to enter to solve the network printer problem:
sudo ufw allow proto all from 192.168.1.0/24 to 127.0.0.1 port 631
sudo ufw allow proto all from 127.0.0.1 port 631 to 192.168.1.0/24
I was also advised to enter this command if the '/etc/hosts' file had an entry for 127.0.1.1:
sudo ufw allow proto all from 192.168.1.0/24 to 127.0.1.1 port 631
sudo ufw allow proto all from 127.0.1.1 port 631 to 192.168.1.0/24
Thanks again for the help. Let me know @ericmarceau if this post is correct--a lot of numbers all over the place.