Ubuntu has been named "lead host and guest operating system" on Hewlett-Packard's fledgling OpenStack-based cloud. Canonical has been working closely with HP during the tech juggernaut's cloud beta, which opened one month ago, to ensure Ubuntu provides a secure and scalable "business-class" cloud "for companies of all sizes". …
This probably has more to do with Debian, a distribution that HP has long supported and seems to prefer if you get technical with them rather than Ubuntu itself. It doesn't hurt that Ubuntu is based on Debian. HP folks were probably wanting Ubuntu because it's basically a commercial version of Debian which is easier to pitch to customers.
(from a Debian user since 1998 - though I've preferred Red Hat in my work places since '04)
HP needs to continue with TouchPad
Hp need to go back re-introduce the touch pad with 2 or three boot options as the tablet is very well made