My opinion, which I've expressed in the past:
Although the Galaxy Nexus is an Android phone off-the-shelf, I don't think that installing or using Ubuntu for phones is within the scope of our site. Questions related to running Ubuntu along side Android (in a chroot environment with VNC, for example) seem okay to me since Android is involved in the process, and we've handled a few here in the past.
Using Ubuntu for phones requires completely replacing the Android OS with Ubuntu. At that point I think we've left the realm of Android Enthusiasts and entered into the realm of Ask Ubuntu. We're built around the Android ecosystem, and though the device may have been originally intended to run Android, using it for a completely different purpose seems beyond our expertise and our scope. I wouldn't expect a Microsoft support forum to help me install Ubuntu on a desktop because it originally came with Windows - I'd expect an Ubuntu community to help me.