sudo apt-add-ppa repository:cheleb/blender-svn
Update the repositories:
sudo apt-get update
If any of you have already installed Blender, simply:
sudo apt-get upgrade
In case you have no Blender azap installed, install it:
sudo apt-get install blender
Already you have it.
For more information:
http://www.atareao.es/ubuntu/conociendo-ubuntu/blender-2-5-beta-en-ubuntu-desde-repositorio/