首先查看steam日志，在/tmp/dumps/下，以“用户名_output.txt”命名。
$ cat /tmp/dumps/liuxu_output.txt
Running Steam on ubuntu 15.10 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1457636973)
libGL error: unable to load driver: r600_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: r600
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
原因是steam用的lib文件太老，找到的结局办法是删掉即可，我个人是建议备份。
$ rm ~/.local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libstdc++.so.6
$ rm ~/.local/share/Steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu/libgcc_s.so.1