It was especially optimised for Lubuntu, a light-weight distro based on Ubuntu.
To install open a Terminal and type :
sudo apt-get install lubuntu-software-center
or use Software Center....
The default view :
There are three tabs at the top: Get Software, Installed Software, and Apps Basket.
If you want to add an application, click the button Add to the Apps Basket :
The Information button will show a description with a screenshot and reviews.
The Apps Basket with the packages to be installed :
Discard button will empty the Apps Basket.
Removing installed software :