Thanks for reporting. We'll take a look at this.

Can you please save off this file:

~/.local/share/Steam/ClientRegistry.blob

and put it in a place where we can download it to take a look?

Thanks.

You can get the file here: http://makuser.de/marc/steam/ClientRegistry.blob

I just got the update. Now i get another error:

09:12:18,4 marc@MAKpc: ~ > steam
Running Steam on ubuntu 12.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
unlinked 0 orphaned pipes
removing stale semaphore last operated on by process 3281 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 3281 with name 0eSteamEngineLock
CAsyncIOManager: 0 threads terminating.  0 reads, 0 writes, 0 deferrals.
CAsyncIOManager: 63 single object sleeps, 0 multi object sleeps
CAsyncIOManager: 0 single object alertable sleeps, 1 multi object alertable sleeps
09:12:25,5 marc@MAKpc: ~ > STEAM_RUNTIME=0 steam
Running Steam on ubuntu 12.04 64-bit
STEAM_RUNTIME is disabled by the user
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
Installing breakpad exception handler for appid(steam)/version(1360379549_client)
unlinked 0 orphaned pipes
removing stale semaphore last operated on by process 3380 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 3380 with name 0eSteamEngineLock
CAsyncIOManager: 0 threads terminating.  0 reads, 0 writes, 0 deferrals.
CAsyncIOManager: 80 single object sleeps, 0 multi object sleeps
CAsyncIOManager: 0 single object alertable sleeps, 1 multi object alertable sleeps

with a dialog telling me a "Fatal Error": http://makuser.de/marc/steam/dialog.png

when i delete (i moved it for further testing) my ClientRegistry it starts up just normal.

I just got some error, after last updated steam client

rytsar@uno-creed:~$steam
Running Steam on ubuntu 12.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Looks like steam didn't shutdown cleanly, scheduling immediate update check
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
unlinked 0 orphaned pipes
Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
[0210/202131:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
/home/rytsar/Steam/steam.sh: line 561: 24255 Segmentation fault      (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
rytsar@uno-creed:~$

sometimes showing like this too

Running Steam on ubuntu 12.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Looks like steam didn't shutdown cleanly, scheduling immediate update check
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
unlinked 0 orphaned pipes
removing stale semaphore last operated on by process 1366 with name 0eBlobRegistryMutex_02F3FA39D4D0731EC12CBBE90CD2EFB6
removing stale semaphore last operated on by process 1366 with name 0eBlobRegistrySignal_02F3FA39D4D0731EC12CBBE90CD2EFB6
removing stale semaphore last operated on by process 1366 with name 0emSteamEngineInstance
removing stale semaphore last operated on by process 1366 with name 0eSteamEngineLock
Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
[0210/072135:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
Installing breakpad exception handler for appid(steam)/version(1360439662_client)
b�
ATIFGLEXTENSION[xcb] Extra reply data still left in queue
[xcb] This is most likely caused by a broken X extension library
[xcb] Aborting, sorry about that.
steam: ../../src/xcb_io.c:575: _XReply: Assertion `!xcb_xlib_extra_reply_data_left' failed.
/home/rytsar/Steam/steam.sh: line 561: 1493 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
rytsar@uno-creed:~$ 

I found this error after set my steam client automatically on "Big Picture" mode. Can you help me?

@rytsar could you please open another issue right here, as it seem like you have not the same problem. https://github.com/ValveSoftware/steam-for-linux/issues/new thank you very much.

@makuser Okay thanks