I'm on Debian 6.0.5 (squeeze) and every now and then I see the following icon in the notifications area of the GNOME2 pannel: but black instead of red. It reads A package manager is working. Usually it just displays the red one after a few seconds, which is Available updates, so I assume it was just looking for updates. But sometimes that's not the case. I don't have the option to auto-install updates so that's probably not it, so I was wondering if there's a way to see which package manager is running.
Clicking on it just opens Synaptic Package Manager, but it does not says what's running.