Here are logs when upgrading to Ubuntu 13.10 from 13.04.
# tail -1 /etc/lsb-release ;uname –ri
Confirm that “Prompt” option is “normal” of /etc/update-manager/release-upgrades file.
# egrep -i ^prompt /etc/update-manager/release-upgrades
Upgrade to 13.10
# do-release-upgrade –d
Please back up important files before the upgrading.
In my environment, it took two hours or so to finish the upgrading.
# tail -1 /etc/lsb-release ;uname -ri