Comment 5 for bug 624072

Scott, No,Update manager does not pop-up on its own. [ I'v tried that again, even now]
We need to remember that the default update-manager behavior is to not prompt for updates everyday.
So, if a non-security update is available it wont automatically pop-up until 7days have passed since the last update.
There are so many ways[ex:apt-pinning] for update manager to not appear after we add a ppa. Moving it as a preferences avoids those scenarios. [for apt-pinning, we need to use synaptic , maybe something that needs to be looked into for USC as well.]