If you run 'ps -ef', you'll see the following shell process:
sh -c "while true; do /usr/bin/xdg-screensaver reset; sleep 30;
done"
Kill that process and the messages will stop.
Bug #883618 really does look like a duplicate of this one, but I'm not
going to mark this as a duplicate because that problem was supposedly
fixed for precise yet people are still reporting the problem. Maybe
it's fixed for upgrades *from* precise (to quantal), not upgrades *to*
precise.
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https://bugs.launchpad.net/bugs/881725
Title:
"xset: unable to open display" while do-release-upgrade via ssh
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