Plans are being made for a new behaviour in update-manager [U-M].
This includes:
No "new updates" notification icons.
No "restart required" notification icon.
And instead:
(quoted from ubuntu-devel, Matthew Paul Thomas:)
###
/.../To reiterate, the intended default behavior for Ubuntu 9.04 is:
* When there are security updates, Update Manager will open and show
them (plus any other available updates) within a day.
* When there are non-security updates, Update Manager will open and
show them *one week* after it was last opened (whether it was last
opened manually or automatically, and regardless of whether updates
were actually installed then).
* When there are no available updates, Update Manager will not open
automatically at all.
###
"Open" refers to starting the U-M unfocused in the background
Also, the "restart required" icon is now replaced with a popup dialog box after updates which, if declined, gives _no further notification_ about suggested reboot.
This in my opinion is highly unwanted, ubtrusive, and inconvenient behaviour.
