Previously, I installed Ubuntu O.S. on my Imac computer. I followed the directions on installation in a book published about Ubuntu. After using Ubuntu for a good while I noticed that my computer was overheating. I have never felt my computer so hot, as it was when I installed Ubuntu. When I was using Ubuntu I once deleted the icon that opened the download center, which comes pre-installed. I tried and tried to reinstall it, but it seemed that there was no way to get the download center back without reinstalling the whole thing. Another issue, when I download an automatic update for Ubuntu my computer was shut off while it was installing: I lost all of my files, since the operating system quit working. I've been wanting to switch to a Linux O.S., that will hopefully run C++ without any issue. But, I've begun to think that Ubuntu isn't a good operating system, since it has a history of destroying CPU's. What type of Linux is worth having, and is there a version of Linux that is more true to the copyleft philosophy than Ubuntu? Ubuntu download center features programs that are for sale, not for free. Are there any other Linux OS's that have better protection against P.C. overheating? In Windows there is often a application, or settings window, that can lower the CPU's Ghzt level, to reduce heat. In the Ubuntu help literature, the "Overheating" section gives no advise or reasoning, other than -More fans need to be used. When I installed Ubuntu, I allocated memory the way that a book advised, using some small partitions for things which I know little about.