Notifying end-users when support is no more

[Francesco Fumanti]

>Fumanti:
>>  There should however be a way for the user to get definitively rid of
>>  the update notification, even if he does not update!
>>
>>  Consider for example a person using Ubuntu on a machine that is
>>  always offline and that offers to him a system that does all that he
>>  wants. As he wants to keep the system as it is, he should have the
>>  opportunity to dismiss the upgrade notification forever.
>
>Such a system wouldn't "know" that it is out-of-support, so there
>wouldn't be a notification bubble...   ;-)

Why does such a system not know it?
Is the end of support based on the date?

Every computer his a close, or am I wrong?

Francesco