I just wanted to add my findings to this thread. Ubuntu 14.10 fresh install, fully updated, downloaded Fog .33b via svn. I got this error repeatedly until I installed it from my user account and not the root account. So if you have enabled and are using the root user via being logged in, it can give this error. Took me WAY to long to figure it out. I don’t know why as I’m not a Linux user but that was my solution.