Ubuntu Server 12.10 x86 is here

You can download the image here.

Ubuntu Server 12.04 x86 is here

You can download the image here.

Ubuntu 12.04 LTS Precise Pangolin is here (x86)

You can download it from here.

Ubuntu 11.10 Oneiric Ocelot is here (x86)

You can download it from here.

Kubuntu 11.04 is here (x86 and x86_64)

You can download the image here.