Ubuntu JeOS

Ubuntu JeOS (pronounced "juice") is a discontinued variant of Ubuntu that is described as "an efficient variant ... configured specifically for virtual appliances." It is a concept for what an operating system should look like in the context of a virtual appliance. JeOS stands for "Just enough Operating System." JeOS has been replaced by Ubuntu Core, which is now an officially supported minimal variant of Ubuntu.
Its first release was Ubuntu JeOS 7.10, and since the release of Ubuntu 8.10 it has been included as an option as part of the standard Ubuntu Server Edition.
Supported platforms.
The latest version of JeOS is optimized for virtualization technologies by VMware, Inc. and the Linux Kernel-based Virtual Machine.
Specifications.
Specifications for version 8.10 and above include: