just search play for ubuntu installer, its a way to chroot and boot an xserver and then you vnc into it... kind of hack, sure, but there are also xservers and busybox, depends on your needs if these options will work for you. i haven't heard much about people using an arm build of ubuntu on droid devices, though, although it seems i remember something about it being worked on
http://www.hardkernel.com/renewal_2011/products/prdt_info.ph...