I have read through the installation instructions from here
and the section on troubleshooting the install makes me laugh. It says this:
Logical? If you are one of the few people installing this on a Nexus 7 then who in the world knows anything at all that will help you?If none of that works, ask a question on Ask Ubuntu
so, I someone asks on this forum for help with this, you know where I am going to direct them.
For suggestions as regards hardware, see this:
It like they used to say about computers, the best one to buy is the one that comes out six months after you have brought the latest one.While mid-range phones can deliver a perfect Android experience, it takes high-end horsepower to drive a phone and a desktop at the same time. Newer multi-core processors are up to the job, and Ubuntu is the killer app for that hot hardware. It’s the must-have feature for late-2012 high-end Android phones.