i just was installing a new virtual box and noticed that my desktop was running on 2D and i cant find a way to return it to 3D. Its getting hard for me to use some of my applications, need some help
To change to UBUNTU (unity 3D) you have to select the session at log in time by clicking on the circle on the upper right corner of the username screen and then select UBUNTU
FROM THERE SELECT UBUNTU
you will enter Unity 3D
Ubuntu will default to 2D if your graphics card does not support 3D acceleration.
I believe you need to enable 3D acceleration in the Virtualbox settings for the VM and install the guest additions. After that if it does not default to 3D, follow Nirmik's instructions.