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Howto find out if a Debian Lenny 64-bit is up-to-date?

When I run sudo aptitude update it only tells me something like

Hit lenny Release
Hit lenny/updates Release
Hit squeeze Release
Reading package lists...

But no updates seems to be actually performed.

Am I missing something ?

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up vote 2 down vote accepted
aptitude update
aptitude upgrade
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Correct version today is aptitude safe-upgrade although upgrade still works, but aptitude gives a warning. – Ahe Jan 27 '10 at 20:10
so what is aptitude update used for when it doesn't update the system? – Vokuhila-Oliba Jan 27 '10 at 20:57
@Vokuhila-Oliba: It fetches (updates) the lists that contain information about every application in the repositories. Based on this lists aptitude upgrade performs the update. – Felix Jan 27 '10 at 21:06

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