Launching Mathematica on Linux
To run Mathematica using a network license, both the client machine and the license server must be on the network and MathLM must be running.
If you do not have a MathLM license server, you will need to activate your copy of Mathematica. Please see "Activating Mathematica" for more information.
Alternatively, if you are running X, an additional menu folder named Wolfram has already been added to the desktop menu. In the folder, an item named Mathematica points to the most recently installed version of Mathematica. File associations have also been modified such that .nb files now associate with the most recently installed version of Mathematica.