Comment 6 for bug 325701

I can't remember exactly that day. I think I found the message when I turned on the computer in the morning, so I had been logged in for at least a day.

Assuming that apport can get confused as you say, it's quite plausible that it did: Although I typically update at least once daily, I tend to reboot only once every few days, so unless the update restarts whatever service it's replacing, the old version can run for a while.