ebox 1.4.3 - system updates behaviour

[caguiar]

We have a few ebox 1.4.3. boxes, and I have doubts regarding the "System Updates" feature.
When I look at "Software Management" -> " System Updates" I get the following result:

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The system components are up to date.
The component list was updated on 6/4/2010 14:22. It will be updated again at night or you can force the update with the console command 'ebox-software'

However when I run apt-get I get a few packages that need upgrade:

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$ sudo apt-get -s upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages have been kept back:
  linux-image-server linux-server
The following packages will be upgraded:
  libc6 libkrb53 libpq5 postgresql postgresql-8.3 postgresql-client-8.3
6 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
Inst libc6 [2.7-10ubuntu5] (2.7-10ubuntu6 Ubuntu:8.04/hardy-updates)
Conf libc6 (2.7-10ubuntu6 Ubuntu:8.04/hardy-updates)
Inst libkrb53 [1.6.dfsg.3~beta1-2ubuntu1.4] (1.6.dfsg.3~beta1-2ubuntu1.5 Ubuntu:8.04/hardy-updates)
Inst libpq5 [8.3.10-0ubuntu8.04.1] (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Inst postgresql-client-8.3 [8.3.10-0ubuntu8.04.1] (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Inst postgresql-8.3 [8.3.10-0ubuntu8.04.1] (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Inst postgresql [8.3.10-0ubuntu8.04.1] (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Conf libkrb53 (1.6.dfsg.3~beta1-2ubuntu1.5 Ubuntu:8.04/hardy-updates)
Conf libpq5 (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Conf postgresql-client-8.3 (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Conf postgresql-8.3 (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)
Conf postgresql (8.3.11-0ubuntu8.04 Ubuntu:8.04/hardy-updates)

Shouldn't these packages show up in the "System Updates" results?