Ubuntu Server 12.04 LTS (Precise Pangolin) Release Images
As announced, Ubuntu Precise has reached the end of it's life.
Ubuntu Cloud Images are the official Ubuntu images and are pre-installed disk images that have been customized by Ubuntu engineering to run on public clouds that provide Ubuntu Certified Images, Openstack, LXD, and more.
For more information, please see the following:
The following directories contain the official released Ubuntu Cloud Images.