[ubuntu] is it supposed to

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http://ubuntuforums.org – hiya everyone I'm new to ubuntu. there is soo much to learn and I'm having to learn it from the beginning. firstly, i have been trying to download a few things from the ubuntu centre, but i noticed i can only download 1 thing at a time, is this how it is supposed to be or is there a setting for it? also when i run ubuntu, the background changes sometimes, as well as the buttons around the windows, they change theme almost, is this supposed to happen or is there a setting for it lool? Finally if there is anyone in the world who can get my ubuntu compiz 3d desktop cube to work that wo (Hardware)