Hi,
I also have this problem, seemingly randomly. Sometimes it starts well,
sometimes it just fails.
The log says nothing more:
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...
[info ] [FileManager]: Asset 0 will be loaded from '/usr/share/games/supertuxkart/data/challenges/'.
[info ] [FileManager]: Asset 1 will be loaded from '/usr/share/games/supertuxkart/data/gfx/'.
[info ] [FileManager]: Asset 2 will be loaded from '/usr/share/games/supertuxkart/data/grandprix/'.
[info ] [FileManager]: Asset 3 will be loaded from '/usr/share/games/supertuxkart/data/gui/icons/'.
[info ] [FileManager]: Asset 4 will be loaded from '/usr/share/games/supertuxkart/data/gui/screens/'.
[info ] [FileManager]: Asset 5 will be loaded from '/usr/share/games/supertuxkart/data/gui/dialogs/'.
[info ] [FileManager]: Asset 6 will be loaded from '/usr/share/games/supertuxkart/data/replay/'.
[info ] [FileManager]: Asset 7 will be loaded from '/usr/share/games/supertuxkart/data/shaders/'.
[info ] [FileManager]: Asset 8 will be loaded from '/usr/share/games/supertuxkart/data/skins/'.
[info ] [FileManager]: Asset 9 will be loaded from '/usr/share/games/supertuxkart/data/ttf/'.
[info ] [FileManager]: Asset 10 will be loaded from '/usr/share/games/supertuxkart/data/po/'.
[info ] [FileManager]: Asset 11 will be loaded from '/usr/share/games/supertuxkart/data/library/'.
[info ] [FileManager]: Asset 12 will be loaded from '/usr/share/games/supertuxkart/data/models/'.
[info ] [FileManager]: Asset 13 will be loaded from '/usr/share/games/supertuxkart/data/music/'.
[info ] [FileManager]: Asset 14 will be loaded from '/usr/share/games/supertuxkart/data/sfx/'.
[info ] [FileManager]: Asset 15 will be loaded from '/usr/share/games/supertuxkart/data/textures/'.
[info ] [FileManager]: Asset 16 will be loaded from '/usr/share/games/supertuxkart/data/tracks/'.
[verbose ] translation: Env var LANGUAGE = 'fr_FR.UTF-8'.
[verbose ] translation: Language 'French (France)'.
[info ] [IrrDriver Logger]: ..:: Antarctica Rendering Engine 2.0 ::..
-------------------------------------8<---------------------------------------
Cheers,
Pierre