Kate Stewart announced the availability of the fourth maintenance update of Ubuntu 10.04 LTS [long term support]. This version include the updates for desktop, servers and alternatives CDs and DVDs for i386 and amd64 both architecture. This version is more stable and more bugs were fixed in this version.
Here also Kubuntu 10.04.4 has also been released and available for download for i386 and amd64 architectures. The next LTS version is Ubuntu 12.04 which will be release in Apr, 2012. After that you can suggested to transfer on that.