What is Mythbuntu based on?

[ed3120]

Is Mythbuntu based on Xubuntu or regular Ubuntu with an XFCE desktop?

[Perpetual]

Based on information on the mythbuntu website it looks to be built on Ubuntu using the XFCE desktop.

Mythbuntu is an Ubuntu derivative focused upon setting up a standalone MythTV system similar to Knoppmyth or Mythdora. Currently, it is a recognized as a community supported project by Canonical. Mythbuntu can be used to install a stand alone Frontend, Backend, or combination machines. Unlike similar projects, Mythbuntu keeps close ties with Ubuntu and all development is given back to the Ubuntu Community. This allows easy conversions from a standard desktop to a Mythbuntu machine and vice versa. The development cycle of Mythbuntu closely follows that of Ubuntu, releasing every six months shortly after Ubuntu releases.

[superm1]

The seeds are branched from the xubuntu seeds which are branched from the ubuntu seeds, which include the desktop platform seeds.
Lots of the stuff that was in the xubuntu seeds is not included however. Just enough to get a basic xfce desktop and then a lot of items for the myth related things.