To be perfectly honest, nothing. But, you can add a comment to that they really should add a bounty to the question. Something like this:
Hello! Welcome to Ask Ubuntu. I've noticed that you are looking for an answer, the best way of attracting attention to your question is to offer a bounty. More details [here](http://meta.stackexchange.com/questions/16065/how-does-the-bounty-system-work)
