Ubuntu 6.06 LTS, Ubuntu 7.10, Ubuntu 8.04 LTS required to be patched
Ubuntu developers have revealed security issues in three editions:
Ubuntu 6.06 LTS,
Ubuntu 7.10,
Ubuntu 8.04 LTS
The problems also affect the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
They are suggesting the users of these editions to upgrade some specific components.
Details here: Linux kernel vulnerabilities

Ubuntu 8.04 LTS now available through Ship It service
Ubuntu 8.04 LTS (Hardy Heron) can be pre-ordered now through Ubuntu’s Ship It service.
The distribution is yet not released. The developers are planning to launch it sometime next week.
They are accepting the orders now and would start delivering it to the users as soon as the final [...]

Ubuntu 8.04 LTS release candidate version released
The developers behind the Ubuntu Linux distribution have released the first release candidate version of their Ubuntu 8.04 LTS (Long-Term Support).
They have made available both desktop and server edition of this distribution. The final release is just few days away.
The developers said in the release post:
We consider this release [...]