Installing COMSOL Multiphysics in Linux mint/ Ubuntu

COMSOL Multiphysics is a finite element analysis, solver and simulation software / FEA software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. The package is cross-platform (Windows, Mac, Linux). In addition to conventional physics-based user interfaces, COMSOL Multiphysics also allows entering coupled systems of partial differential equations (PDEs)

It is found that Comsol is faster in linux compare to windows. So i am giving you all tutorial to install comsol in linux... :)