If you continue, an additional ssh daemon will be started at port ‘1022’

You may get this message “If you continue, an additional ssh daemon will be started at port ‘1022’” while you try to upgrade Ubuntu Server from version 18.04 to 20.04 over a remote SSH connection.

This is a failsafe option to connect to the server if the default SSH connection is interrupted at the time of upgrade. To proceed with the next steps, you can safely press the keys “y” and “Enter”. At the same time, if you have enabled the firewall, ensure that port 1022 or whatever port that was mentioned in the upgrade notice is opened up for external access.