Running Steam on ubuntu 16.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1484790260)
Installing breakpad exception handler for appid(steam)/version(1484790260)
Installing breakpad exception handler for appid(steam)/version(1484790260)
Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"

(steam:19155): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita",

(steam:19155): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita",
/usr/share/themes/Adwaita/gtk-2.0/gtkrc:1163: error: unexpected identifier `direction', expected character `}'
Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"
Installing breakpad exception handler for appid(steam)/version(1484790260)
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 72: non-double matrix element
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 72: non-double matrix element
Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 80: saw unknown, expected number
ICE default IO error handler doing an exit(), pid = 19155, errno = 17
[2017-02-24 17:33:46] Startup - updater built Jan 19 2017 01:22:13
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[2017-02-24 17:33:46] Checking for update on startup
[2017-02-24 17:33:46] Checking for available updates...
[2017-02-24 17:33:46] Download skipped: /client/steam_client_ubuntu12 version 1484790260, installed version 1484790260
[2017-02-24 17:33:46] Nothing to do
[2017-02-24 17:33:46] Verifying installation...
[2017-02-24 17:33:46] Performing checksum verification of executable files
[2017-02-24 17:33:47] Verification complete
Assert( Assertion Failed: CFrameFunctionMgr::~CFrameFunctionMgr: non static FrameFunction[CHTTPClient::BFrameFuncHandleCompletedWorkItems] still registered ):framefunction.cpp:120

Installing breakpad exception handler for appid(steam)/version(1484790260)
assert_20170224173352_2.dmp[19193]: Uploading dump (out-of-process)
/tmp/dumps/assert_20170224173352_2.dmp
framefunction.cpp (120) : Assertion Failed: CFrameFunctionMgr::~CFrameFunctionMgr: non static FrameFunction[CHTTPClient::BFrameFuncHandleCompletedWorkItems] still registered
assert_20170224173352_2.dmp[19193]: Finished uploading minidump (out-of-process): success = yes
assert_20170224173352_2.dmp[19193]: response: CrashID=bp-0f0a59c1-1d12-458e-a7fe-f6c182170224
assert_20170224173352_2.dmp[19193]: file ''/tmp/dumps/assert_20170224173352_2.dmp'', upload yes: ''CrashID=bp-0f0a59c1-1d12-458e-a7fe-f6c182170224''