In previous version (Ubuntu 8.10), when you shutdown your computer – no dialog appears. I am happy with this. I think many users also like this – same to me. In Windows, if you shutdown – it asks you for confirmation. It makes us confuse a lot and take time for an action to choose OK – I REALLY WANT TO SHUTDOWN – BECAUSE I FEEL SO TIRED – I WANT TO LEAVE MY COMPUTER AS SOON AS POSSIBLE.
To improve it, MS Vista and Windows 7 do not show this dialog any more. Why Ubuntu 9.0.4 does a backward thing? Why they don’t research common behavior of end user? I don’t know. It’s quite difficult to understand.