I upgraded my ubuntu to 11.10 on day one but the unity 3d is not there as an option. I have User Defined, Recovery Mode and Ubuntu 2D.
I've done this test
/usr/lib/nux/unity_support_test -p and all results are green YES. Here's the result
OpenGL vendor string: ATI Technologies Inc. OpenGL renderer string: AMD Radeon HD 6700 Series OpenGL version string: 4.1.11005 Compatibility Profile Context Not software rendered: yes Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: yes