People seem to forget what chroot is
http://searchsecurity.techtarget.com...-not-to-chroot
http://en.wikipedia.org/wiki/Chroot
IT has nothing to do with the lack of native code or not. They are simply sand boxing the components. The components that make up Ubuntu are simply being put in a chroot jail. I am not the most knowledgeable person about this but my guess is that they are doing this to keep the average person from messing it up. It is technically an Ubuntu system if you SSH into you will find the components are similar to a regular Ubuntu system. I don't get what the problems are it simply shares display flinger and the Android Kernel for the sake of compatibility. It is not a skin on Android it is Ubuntu with certain Android components.