Below is the press release which the detail can be found in here:
"The Ubuntu team is proud to announce the release of Ubuntu 10.04.2 LTS, the second maintenance update to Ubuntu's 10.04 LTS release. This release includes updated server, desktop, alternate installation CDs and DVDs for the i386 and amd64 architectures. Numerous updates have been integrated, and updated installation media has been provided so that fewer updates will need to be downloaded after installation. These include security updates and corrections for other high-impact bugs, with a focus on maintaining stability and compatibility with Ubuntu 10.04 LTS."Following that Ubuntu 10.4.2 release, Xubuntu and Kubuntu also release Xubuntu 10.4.2 and Kubuntu 10.4.2 both for i386 and amd64 architectures. Ubuntu user who regularly update their Ubuntu 10.04 systems no need to download the new CD images.