As you know Ubuntu’s (and Ubuntu Studio) 14.04 package of Blender is 2.69, and you perhaps using 2.71, and you have it in your Home directory. When you using background ( terminal whiteout GUI) rendering you start Blender 2.69, and this is perhaps not what you want.
(or you have a PPA Blender 2,71 installation , but you get errors when you render from terminal, or don’t trust it)
Blender 2.69 (or your PPA 2,71 installation) start file is in /usr/lib/blender/
To do this you must be root…
I renamed the blender file to ‘blenderzzzzzzzzzz’ in the ‘/usr/lib/blender/’ directory.
I made a link from my Blender 2.71 blender start file to /usr/lib/blender/.
Renamed the ‘/usr/lib/blender/’ “link to blender” file to ‘blender’
And all is honky dory.