This may be bug #1075 but would you be able to provide your system information as requested here https://github.com/ValveSoftware/steam-for-linux#reporting-issues
I believe this is fixed. Please report a new bug if you get this issue now.
Nothing extracted yet.
Steam client crashed on startup. Here is terminal output:
ivan@liberty:~$ steam
Running Steam on ubuntu 12.10
STEAM_RUNTIME is enabled automatically on ubuntu
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
unlinked 0 orphaned pipes
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
[0203/131037:ERROR:object_proxy.cc(239)] Failed to call method: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.NetworkManager was not provided by any .service files
[0203/131037:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
PulseAudio connect failed (used only for Mic Volume Control) with error: Нет доступа
Process 1809 created /ValveIPCSharedObjects3
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
Generating new string page texture 2: 48x256, total string texture memory is 49,15 KB
Generating new string page texture 3: 256x256, total string texture memory is 311,30 KB
Uploading dump (in-process) [proxy '']
/tmp/dumps/crash_20130203131043_1.dmp
Installing breakpad exception handler for appid(steam)/version(1359765526_client)
success = yes
response: CrashID=bp-ac883637-1c02-4419-a892-694dd2130203
/mnt/a/Steam/steam.sh: строка 443: 1809 Ошибка сегментирования $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"