Re: Which Tablet can I install Ubuntu ?
What you need is a desktop computer, then, with a touchscreen monitor that you can mount on the wall.
Ubuntu doesn't run on tablets yet, and tablets don't come with an Ethernet port. If you don't want to get Wifi, then you can't use a tablet for streaming video (3G is not reliable enough).
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.