Duda, I tried reproducing this problem in Ubuntu Software Center 2.1.18
in Ubuntu Maverick, and could not.
Here's what I did:
1. Install Tux Paint.
While Tux Paint is still installing:
2. Navigate to Pre-School Bundle and choose "Install".
3. Navigate to HomeBank and choose "Install".
ubuntu-edu-
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/34084178/Dependencies.txt
** Attachment added: "XsessionErrors.txt"
http://launchpadlibrarian.net/34084179/XsessionErrors.txt
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Software center misses queue after already installed app
https://bugs.launchpad.net/bugs/4