If you need to specify a specific answer use the following

sudo sh -c 'echo "y\n\ny\nN\nN\nN\nN\nN\nN\nN\nN\nN\nN\nN\n" |
DEBIAN_FRONTEND=noninteractive /usr/bin/do-release-upgrade'


I agree though, the documentation should be a little better the
functionality is there.

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https://bugs.launchpad.net/bugs/1007543

Title:
  Release upgrading requiring user input baffles inexperienced users

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