lubuntu

[ZUNGU O BONGANI]

hi there,
i have moved to linux recently and found lubuntu as a perfect start for me in the linux space,something i found to be a problem is the filesystem structure really different from windows.
i used the software center to download some apps which i downloaded and installed perfectly ,to my dismay i couldn't find the path where the packages were installed and worse of i was running lubuntu as a liveusb so i lost all the packages after i shut down the system,my main question is where do i find the apps and their all dependencies that i have downloaded via the software center so that i can install them again the next time i run lubuntu and not having to download again and again....
regards,
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