On Ubuntu 14.04 64bit Steam version... I wasn't seeing any of the menu text and some UI elements were missing. I looked over some previous comments, made sure mscorefonts was installed, set it to use the 64bit version in Steam, etc. I finally got the text and missing elements to show up by editing ~/.steam/steam/steamapps/common/Kerbal Space Program/settings.cfg and changed "FULLSCREEN = False" to "FULLSCREEN = True". My displays native resolution is 1280x1024, the config file is set to 1280x720. If I set it to 1280x1024, the text and UI elements disappear again. This seems kind of messed up. Is this the way it's supposed to be? Other than that, it seems to run fine.