Ubuntu 12.04 Precise (64bit/amd64) images for VirtualBox and VMware released
So Ubuntu 12.04 64bit/amd64 virtual machines are now available for VirtualBox (VDI) and VMware (VMDK). Ubuntu’s proud tradition of integrating the latest and greatest open source technologies into a high-quality, easy-to-use Linux distribution. The team has been hard at work through this cycle, introducing a few new features and improving quality control. Long term support maintenance updates will be provided for Ubuntu 12.04 for five years, through April 2017.
You can download VDI image for VirtualBox & VMDK image for VMware from here.