here is te response from terminal:
Running Steam on kali 1.0 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1377723241_client)
Xlib: extension "GLX" missing on display ":0.0".
Installing breakpad exception handler for appid(steam)/version(1377723241_client)
unlinked 0 orphaned pipes
removing stale semaphore last operated on by process 5859 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 5859 with name 0eSteamEngineLock
/home/buildbot/buildslave_steam/steam_rel_client_ubuntu12_linux/build/src/tier0/threadtools.cpp (1790) : Assertion Failed: Arquivo existe
Assert( Assertion Failed: Arquivo existe ):/home/buildbot/buildslave_steam/steam_rel_client_ubuntu12_linux/build/src/tier0/threadtools.cpp:1790

Installing breakpad exception handler for appid(steam)/version(1377723241_client)
Uploading dump (out-of-process) [proxy '']
/tmp/dumps/assert_20130831162032_4.dmp
unlinked 2 orphaned pipes
CAsyncIOManager: 0 threads terminating. 0 reads, 0 writes, 0 deferrals.
CAsyncIOManager: 47 single object sleeps, 0 multi object sleeps
CAsyncIOManager: 0 single object alertable sleeps, 1 multi object alertable sleeps
[2013-08-31 16:20:32] Startup - updater built Aug 28 2013 13:29:34
[2013-08-31 16:20:32] Verifying installation...
[2013-08-31 16:20:32] Verification complete
Shutting down. . .
[2013-08-31 16:20:32] Shutdown