mac_v > I've posted some answers in this comment :
https://bugs.edge.launchpad.net/ubuntu/+source/update-
notifier/+bug/332945/comments/430

It's up to the user to choose when he wants to update. Forcing him is
*never* the good time. Poping up a window will *always* be annoying.
When a normal user open his computer, it's because he needs it, maybe
urgently. So any popup is an annoyance and immediately dismissed.  100%
of the Ubuntu users I support (close friends, family, related) told me
that they had a bug because the update window was poping up *every time*
without reason (they didn't ask for an upgrade so it was considered as a
bug and they are right)


Basic usability rules :

1) Never do something unexpected except if it's critical to preserve
user data.

Other usability rules :

2) Never popup a window without being asked for it. It will always when
you do not want it (typical example : a public presentation with your
computer plugged on a beamer)

3) Never ask anything at start. Starting the computer is not a special
event and, generally, when the user boot his computer, he want to do
something. This something might be urgent (like checking train timetable
or the hour of a meeting quickly in an elevator). Anything that slow him
is a bug.

4) Listen to the user. If the user close without doing an upgrade, don't
open it again a few minutes/hours/days later. I've often heard : "I did
the upgrade! It still appears! There's no way to make this window
disappearing once for all?" (there are some upgrade nearly every day in
the weeks after a release)

5) Allow user to discard and recover later : if the user closes the
windows, it's hard to find how to do the upgrade if he doesn't know the
administration menu (most users don't and it should not be required).
With the notification icon, the user is warned but can keep it for
later. My mother used to say "there's the orange icon. I will wait the
next time you come here to do that upgrade so you can solve it if there
is any trouble". Since Jaunty, she had not do any upgrade at all, only
complained about the popping window.

6) Never force the user to do anything. It's simply bad experience.
People hate being forced to do stuff, even if they know they have to.
Say "you have to drink water when doing sport" and people will listen.
Give a glass of water, put in the mouth of someone and say "drink!" is
simply not an accepted behaviour (even by thirsty people). (this analogy
is seen by many researchers as one main reason why people dislike
current technologies. They feel that they are not empowered but, au
contraire, that they have to fight the technology. But I disgress…)


In fact, I tend to believe that only geeks that have their computer always on 
can consider the current behaviour as "not too annoying". I'm sorry, but none 
of the comments I've read answered my questions (I might have overlooked some, 
given the high number). I still cannot find any usability point that were 
improved with the current behaviour. Disabling the updater daemon is now part 
of my installation routine for newbies. (well, I'm still looking for someone 
that will find that useful so I do it only when they tell me they have a bug 
with a window appearing all the time).

I also cannot understand why so much work is put in the notification
system (I really *love* it) if it's not used when you want to notify the
user about something.

-- 
[Jaunty] Update Notifier icon would provide useful status information / new 
update-manager behaviour is annoying
https://bugs.launchpad.net/bugs/332945
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