supertux upgrade

Hi, I get following errors when try to upgrade (it is install now after earlier crash) supertux.

From Synaptic:

could not mark all packages for installation or upgrade +ubuntu

supertux:
  Depends: libc6 (>=2.4-1) but 2.3.6-0ubuntu20.5 is to be installed
  Depends: libgcc1 (>=1:4.1.1-12) but 1:4.0.3-1ubuntu5 is to be installed
  Depends: libsdl-image1.2 (>=1.2.5) but 1.2.4-1 is to be installed
  Depends: libsdl1.2debian (>=1.2.10-1) but 1.2.9-0.0ubuntu2 is to be installed
  Depends: libstdc++6 (>=4.1.1-12) but 4.0.3-1ubuntu5 is to be installed

I tried to install, but suddenly my screen had mega-fonts and 4x usual size.

I have no idea what this means.
At present I use Ubuntu 6.06