In Terminal
$sudo aptitude search package name
It will gives you the package list which contains your package name. It also tells you whether this package is installed in your machine or not.
Installed Package - starts with 'i'
Not installed Package - starts with 'p'
for eg.,
sudo aptitude search firefox-3
i A firefox-3.0 - safe and easy web browser from Mozilla
i A firefox-3.0-branding - Package that ships the firefox branding
p firefox-3.0-dev - Development files for Mozilla Firefox
p firefox-3.0-dom-inspector - dummy upgrade package for firefox-3.0-dom-inspector -> xulrunner-1.9-dom-inspect
p firefox-3.0-gnome-support - Support for Gnome in Mozilla Firefox
p firefox-3.0-venkman - dummy upgrade package for firefox-3.0-venkman -> xulrunner-1.9-venkman
p firefox-3.1 - dummy upgrade package for firefox-3.1 -> firefox-3.5
p firefox-3.1-branding - dummy upgrade package for firefox-3.1 -> firefox-3.5
p firefox-3.1-dbg - dummy upgrade package for firefox-3.1 -> firefox-3.5
p firefox-3.1-dev - dummy upgrade package for firefox-3.1 -> firefox-3.5
p firefox-3.1-gnome-support - dummy upgrade package for firefox-3.1 -> firefox-3.5
i firefox-3.5 - safe and easy web browser from Mozilla
i A firefox-3.5-branding - Package that ships the firefox branding
p firefox-3.5-dbg - firefox-3.5 debug symbols
p firefox-3.5-dev - Development files for Mozilla Firefox
p firefox-3.5-gnome-support - Support for Gnome in Mozilla Firefox
nice info
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