supertuxkart: error while loading shared libraries: libIrrlicht.so.1.7a.3: cannot open shared object file: No such file or directory
Make sure that libirrlicht1.7a is installed.
sudo apt-get install libirrlicht1.7a
sudo ln -s libIrrlicht.so.1.7a.2 libIrrlicht.so.1.7a.3
It's obviously not a permanent fix, but I haven't had any problems playing.