Bonjour,
Pour lancer Tochlight II version Steam.
Ouvrir le terminal
cd ~/.local/share/Steam/steamapps/common/Torchlight\ II/lib64/
ln -s ~/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libfontconfig.so.1
Voilà vous pourrez lancer le jeu !