Can not enable 3D acceleration on Ubuntu 14.04 inside VirtualBox [closed]

I had the exact same issue except that I run VirtualBox 4.3.12r93733 on a Windows 7 host, not OSX.

After trying many different things without success, I had a look at the linked VirtualBox bug report which claimed "fixed as of 27 May 2014 in VirtualBox 4.3.x and later releases".

The very last comment (as of today) has a link to a recent CD image for the VirtualBox Guest Additions.

After installing this in my 14.04 guest, the command line

/usr/lib/nux/unity_support_test -p

finally reports

Unity 3D supported: yes

and all the Unity window animations are smooth as butter.

Update 2014-07-20:

According to the latest comments on this answer, there is no need for downloading the CD image any more, as it has finally become part of the official VirtualBox distribution. So if you upgrade, you'll get the fixed Guest Additions.

If you're stuck with a VirtualBox version without the fixed Guest Additions, you can get the CD images from the VirtualBox download repository - just find the correct version's folder and get the VBoxGuestAdditions_*.iso file inside it.

If you haven't enabled 3D acceleration with VirtualBox settings themselves, use this.

Go to the settings of the VirtualBox that Ubuntu is running in, click Video, and click enable 3d acceleration.