The default installation path for MotionBuilder on a Linux OS is: /usr/autodesk/MotionBuilder<Version>.
Some MotionBuilder keyboard shortcuts may not work as expected under the KDE or Gnome environment.
You can change the Linux default Alt key mapping to META (Windows) to enable the MotionBuilder Alt-drag behavior to function. Depending on the KDE and Gnome versions, the methods of selecting the key bindings may differ. Refer to the KDE and Gnome documentation to customize the default keyboard shortcuts.