The following packages have been kept back

I run a debian Mailserver with Postfix..(the best MTA available in my opinion!) within my debian box, I use the apt-get upgrade functions for security updates. for a little while I kept seeing this message when upgrading:
The following packages have been kept back
Well Google is your best friend and helped find this article which explains why this happens:
Some upgrades show packages being kept back
In short: to fix it you type the command: apt-get dist-upgrade
Posted: July 22nd, 2006 under Linux.
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