http://brainstorm.ubuntu.com/item/18460/
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.

[32 votes] Solution #1: Revert


[1 votes] Solution #2: securtiy updates on by default in background.


]]> en-us Thu, 05 Mar 2009 21:10:26 +0000 Mon, 24 Aug 2009 09:41:01 +0000 QAPoll module http://brainstorm.ubuntu.com/idea/18460/
I leave several apps open and my machine on all the time - I don't like seeing an extra app lurking on the panel. If you want the new behaviour by default, let users switch it off please.]]> Tue, 09 Jun 2009 16:05:09 +0000