I tried purging steam, un-installing and reinstalling steam, deleting /home/.steam/share/steam/appcache/, deleting everything in /home/.steam/share/steam/ and nothing helped. I installed Ubuntu, then steam into it directly afterward. I installed steam from Ubuntu Software Centre, launched it, it updated 206MB, then closed. When I tried to launch it again, it momentarily flashes the checking for update dialogue, then closes every time. Then (in an unrelated event) Ubuntu said some system updates are necessary and one of them was Steam launcher. I did the update, tried to launch Steam; same story. Really need help on this, as I did a complete re-isntall of Ubuntu, then Steam again and it did not help at all. Here's the log: user@computer:~$ steam Running Steam on ubuntu 13.10 64-bit STEAM_RUNTIME is enabled automatically Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) unlinked 0 orphaned pipes removing stale semaphore last operated on by process 2297 with name 0eBlobRegistryMutex_313E4D748EE12691A95DDE8913185F7E removing stale semaphore last operated on by process 2297 with name 0eBlobRegistrySignal_313E4D748EE12691A95DDE8913185F7E removing stale semaphore last operated on by process 2297 with name 0emSteamEngineInstance removing stale semaphore last operated on by process 2297 with name 0eSteamEngineLock Gtk-Message: Failed to load module "overlay-scrollbar" Gtk-Message: Failed to load module "unity-gtk-module" Installing breakpad exception handler for appid(steam)/version(1381282832_client) Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number [1030/115016:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Steam: An X Error occurred X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 18 (X_ChangeProperty) Value in failed request: 0x0 Serial number of failed request: 105 xerror_handler: X failed, continuing Uploading dump (out-of-process) [proxy ''] /tmp/dumps/crash_20131030115012_1.dmp /home/user/.local/share/Steam/steam.sh: line 717: 2650 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@" Finished uploading minidump (out-of-process): success = yes response: CrashID=bp-484ddae7-0b1c-4ae4-be84-42a9c2131030 Thanks in advance.