I think it is a really easy problem, but Google could not help and this searching function neither. I love kile, but the settings section is like a big mess for me. I would love to turn on a bar on the side of the document, which shows me the line numbering? Not in the finished PDF but in the "working area" of kile.
While typing in the editor window, I get a message that says, "Could not open file:///tmp/kile-livepreview.RDNKpj/p.pdf". So, when I look for this file, I do have permissions to access it -- it is the PDF version of what I am typing.