In ubuntu use synaptic package manager, in SuSE use the YaST package tool for installing/removing software.
You must understand, that deb and rpm packages are not executable files like exe installers in windows. You need to use a console, or a graphical package manager to install them. This is a better approach for software management, since only one application is used to install/update/remove anything on your system. These package managers download software form package repositories, servers hosting thousands of packages, so you don't need to download everything separately. Package managers also solve dependecie problems. I mean, when you want to install something, it has dependecie packages (other software needed to run and use this particular one). The package manager check for these apps, and marks them for installation, so you don't need to look for them.
When a package cannot be found in the repositories, but you downloaded from somewhere, you still can install them separatelly, using the command line or mc. You can check the forums archive how to do that.
I hope, I helped to understand how software management goes on Linux based systems.
Last edited by pusrob; 11-25-2007 at 11:40 AM.