系统是fedora 21 64 bit
已经安装各自32位包和nvida最新驱动
运行时的错误信息如下
Running Steam on fedora 21 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0_client)
/home/ng-fedora/.local/share/Steam/steam.sh: line 730: 18486 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$STEAMEXEPATH" "$@"
mv: cannot stat ‘/home/ng-fedora/.steam/registry.vdf’: No such file or directory
Installing bootstrap /home/ng-fedora/.local/share/Steam/bootstrap.tar.xz
Reset complete!
Restarting Steam by request...
Running Steam on fedora 21 64-bit
STEAM_RUNTIME has been set by the user to: /home/ng-fedora/.local/share/Steam/ubuntu12_32/steam-runtime
Installing breakpad exception handler for appid(steam)/version(0_client)
/home/ng-fedora/.local/share/Steam/steam.sh: line 730: 18578 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$STEAMEXEPATH" "$@"

问题已经解决 ：
原文：
line730 is a quite common error , just reinstall your graphics driver .
重装驱动即可