I also couldn't install the application. I got the error: Unable to install 'Tuxrace'. Some application packages required for the installation are missing. Clicking on 'Details' tells me that the missing packages are libxmu6 and libgles1 I'm not a linux techie and have no idea about shared libraries and symlinks. I'm an ordinary user who simply downloads applications and installs them, and I've never had any problems installing applications until now. I haven't installed many apps at all, so space is not a problem. It's those two missing packages causing the problem.