Hasta ahora, las LTS de Ubuntu han tenido soporte para updates por 3 años para la edición Desktop y 5 años para la edición Server.
Tal como corresponde a su numeración 12.04, su versión final estará disponible en Abril de 2012.
1 de Diciembre de 2011: Alpha 1
Kate Stewart has announced the availability of the first alpha release of Ubuntu 12.04, code name "Precise Pangolin": "We are pleased to bring you the first set of developer images that capture the current fleeting reality of our Precise Pangolin (Ubuntu 12.04 alpha 1) as it starts to emerge. Alpha 1 includes the 3.2.0-2.5 Ubuntu kernel which is based on the latest mainline 3.2-rc3 Linux kernel. This is an update from the 3.0 kernel in Oneiric. Another noticeable change is the consolidation of the amd64 server flavor into the generic flavor. This will help minimize the maintenance burden over the life of this LTS release. The alpha 1 kernel also adds support for additional ALPS touchpads, contains an updated seccomp patch set, and numerous configuration changes. See the release announcement and release notes for a more detailed list of new features, changes and known issues. Download (SHA256): precise-desktop-i386.iso (703MB, torrent), precise-desktop-amd64.iso (695MB, torrent). Also made available today were 12.04 alpha 1 images for Kubuntu (download), Xubuntu, (download), Lubuntu, (download) and Edubuntu (download).
2 de Febrero de 2012: Alpha 2
Kate Stewart has announced the availability of the second alpha release of Ubuntu 12.04, code name "Precise Pangolin": "Welcome to Precise Pangolin Alpha 2, which will in time become Ubuntu 12.04. Alpha 2 is the second in a series of milestone images that will be released throughout the Precise development cycle. This is the first Ubuntu milestone release to include images for the armhf architecture, for the ARM CPUs using the hard-float ABI. New packages showing up for the first time include Linux Kernel 3.2.2, Upstart 1.4, Unity 5.0, LibreOffice 3.5 beta 2. See the release announcement and read the detailed release notes for a more complete picture of what's new in this release. Download (SHA256): precise-desktop-i386.iso (714MB, torrent), precise-desktop-amd64.iso (712MB, torrent). Also released today were 12.04 alpha 2 images for Kubuntu (download), Xubuntu, (download, announcement), Lubuntu, (download), Edubuntu (download) and Mythbuntu (download).1 de Marzo de 2012: Beta 1
22 de Marzo de 2012: Beta 2
19 de Abril de 2012: Release Candidate
26 de Abril de 2012: Ubuntu 12.04 versión final