I upgraded to natty last night... ppa:littel-jo/stk-0.7.1 was in my sources as suggested in the "stuck on zippers" thread.
I installed the updates to STK that were available and the game won't start. When I run it from command line I get this error:
supertuxkart: error while loading shared libraries: libIrrlicht.so: cannot open shared object file: No such file or directory