[ubuntu-art] update-notifier icon

[Julian Turner]

Étienne Bersac wrote:
> You're right. Maybe a up-arrow should fit the idea of upgrade/update ?

That's probably not a good idea, since it's a metaphor based on language
(like the old "log" icon for the system log. We shouldn't do that,
because such metaphors won't necessarily work in all languages.
What icons do other popular desktop OS's use for updates?

Julian