Hello community.

I only use open source softwares to begin by the S.O is ubuntu 13.04. I need your help in this  urgent question. I need to find where are the toolbar, the menu and the command window that simply disappeared when a opened o DS. I already tried to reinstall it and the problem persist. In truth this is the second time that this happen. In first time that this happened I reinstalled all from the O.S, but now I have too much things to make back up and reinstall again.