Noob-pronterface.py - Slicing setting problem

I a total noob to this as well as Ubuntu, which is what I'm running this on.
When I open Prointerface and try to go into Slicing setings all I get is a message in the message box saying
"Entering skeinforge settings: python ./skeinforge/skeinforge_application/skeinforge.py"
No new window ever opens it just sits there, please help! Thanks in advance!
Dave

If I go into the folder and double click on "skeinforge.py" Gedit opens up the file.

Thanks guys, solved it, installed IDLE(Tkinter), works great now,damn instructions would be nice.
Dave