Ubuntu 14.04 host compatibility updates

Hi. I've been emailing Jaryd about ways that I can contribute to the DuckDuckHack community with my sysadmin skills. (iwanttohack@duckduckgo.com and Caine are CC'd.) Jaryd suggested that I improve the VMs, so I suggested that I generate the VMs as much as possible from duckpan-vagrant.

Before I could do that though, I had to make these changes to get duckpan-vagrant to work on my Ubuntu 14.04 host.

I have not tested these changes yet on Ubuntu 12.04. I could install Ubuntu 12.04 on a spare physical computer at home and test them 1st if you'd like.

-Mike