Quote:
But i don't know if the system :
dowloads the updates
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It won't unless you tell it to. It should ask, and in my experience, it always does.
Usually you are offered the details of what is going to be updated, and you can choose if you want to do that, or not.
Quote:
if the downloaded updates are immidiately installed
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If you choose to update an application, Eg Firefox, the update will be installed, but you won't notice until you restart Firefox or logout and login again. Even then, you might not notice any difference in behaviour, but perhaps security issues have been fixed (invisibly to you, as a user).
Quote:
some updates need to reboot the system. does it automatically reboot or
does he(the system) inform me ? (where ?)
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AFAIK the only "update" that needs a reboot is a kernel update.
This will not be applied until you reboot. Then the new kernel will be used to run your computer.
If the kernel update is not to your liking, you can revert to your previous kernel from the
grub boot menu.
Please learn the correct usage of spelling and capitalisation for your future posts.