リモートデスクトップでMathematicaが立ち上がらなかった。下記のURLにあった解決策を実行したら立ち上がった。 Mathematica on Raspberry pi2 failed starting up under RDP condition. ( RDP disconnected and Mathematica didn’t run) Fortunately I found a solution at the following site. 'https://www.raspberrypi.org/forums/viewtopic.php?f=94&t=131051
My installation trial of virtualbox into windows8.1 failed as fatal error. So I omitted USB support from installation conditions and succeeded the installation .