[ubuntu] Deleted wireless and others....

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http://ubuntuforums.org – While trying to delete Bluetooth through Synaptic Package Manager I seem to have gone and deleted (somehow) what makes my wireless work. Also, evolution mail no longer exhists. How I managed this I have no idea. I though I was only deleting what had to do with bluetooth. My question: Is it possible to save this situation by reinstalling the components or would I be better off just doing a reinstalation from the boot disk, erasing everything and starting over? All comments welcome. Particularly those highlighting my bone-headedness. (Hardware)