The Mad Vulcan - 2014-03-10

I'm trying different images because the small Ubuntu distro wasn't doing it for me. I don't seem to be able to get the DE for the large distro to load properly. Needs more RAM than I have, maybe? All I get is a white screen with a mouse pointer.

Anyway, my main question is how do I thoroughly uninstall any of these images from my phone? Will deleting the Ubuntu folder containing the .img and two config files get everything or is there somewhere else I need to find?