Do you mean you want to re-install an already installed package?
Try aptitude reinstall then, which only completes installed packages..
:)
I am closing this as bug report as invalid.
** Changed in: zsh (Ubuntu)
Status: New = Invalid
** Changed in: zsh (Ubuntu)
Importance: Undecided =
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/43544823/Dependencies.txt
--
Missing installed packages in suggestions for aptitude
https://bugs.launchpad.net/bugs/559210
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