Your system information

• Steam client version (build number or date): 1623193086
• Distribution (e.g. Ubuntu): 20.04.02
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

before the last update - it worked no issues

Running Steam on ubuntu 20.04 64-bit
STEAM_RUNTIME is enabled automatically
Pins up-to-date!
Steam client's requirements are satisfied
WARNING: Using default/fallback debugger launch
/home/denz0x13/.steam/debian-installation/ubuntu12_32/steam
[2021-06-09 17:55:32] Startup - updater built Jun  8 2021 22:23:36
Installing breakpad exception handler for appid(steam)/version(1623193086)
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[2021-06-09 17:55:32] Loading cached metrics from disk (/home/denz0x13/.steam/debian-installation/package/steam_client_metrics.bin)
[2021-06-09 17:55:32] Using the following download hosts for Public, Realm steamglobal
[2021-06-09 17:55:32] 1. https://cdn.akamai.steamstatic.com, /client/, Realm 'steamglobal', weight was 100, source = 'update_hosts_cached.vdf'
[2021-06-09 17:55:32] 2. https://cdn.cloudflare.steamstatic.com, /client/, Realm 'steamglobal', weight was 100, source = 'update_hosts_cached.vdf'
[2021-06-09 17:55:32] 3. http://media.steampowered.com, /client/, Realm 'steamglobal', weight was 1, source = 'baked in'
Installing breakpad exception handler for appid(steam)/version(1623193086)
[2021-06-09 17:55:32] Checking for update on startup
[2021-06-09 17:55:32] Checking for available updates...
[2021-06-09 17:55:32] Downloading manifest: https://cdn.akamai.steamstatic.com/client/steam_client_ubuntu12
Installing breakpad exception handler for appid(steam)/version(1623193086)
[2021-06-09 17:55:33] Download skipped: /client/steam_client_ubuntu12 version 1623193086, installed version 1623193086, existing pending version 0
[2021-06-09 17:55:33] Nothing to do
[2021-06-09 17:55:33] Verifying installation...
[2021-06-09 17:55:33] Performing checksum verification of executable files
[2021-06-09 17:55:33] Verification complete
Loaded SDL version 2.0.15-6501165
Gtk-Message: 17:55:33.645: Failed to load module "gail"
Gtk-Message: 17:55:33.646: Failed to load module "atk-bridge"
Gtk-Message: 17:55:33.646: Failed to load module "appmenu-gtk-module"

(steam:123944): Gtk-WARNING **: 17:55:33.649: Unable to locate theme engine in module_path: "adwaita",
/home/denz0x13/.themes/Minwaita-Dark/gtk-2.0/main.rc:728: error: unexpected identifier 'direction', expected character '}'

(steam:123944): Gtk-WARNING **: 17:55:33.650: Unable to locate theme engine in module_path: "adwaita",
Steam: An X Error occurred
X Error of failed request:  BadAtom (invalid Atom parameter)
Major opcode of failed request:  20 (X_GetProperty)
Atom id in failed request:  0x0
Serial number of failed request:  12
xerror_handler: X failed, continuing
Steam: An X Error occurred
X Error of failed request:  BadAtom (invalid Atom parameter)
Major opcode of failed request:  20 (X_GetProperty)
Atom id in failed request:  0x0
Serial number of failed request:  13
xerror_handler: X failed, continuing
Steam: An X Error occurred
X Error of failed request:  BadAtom (invalid Atom parameter)
Major opcode of failed request:  20 (X_GetProperty)
Atom id in failed request:  0x0
Serial number of failed request:  14
xerror_handler: X failed, continuing
Installing breakpad exception handler for appid(steam)/version(1623193086)
STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy
Could not connect to X session manager: None of the authentication protocols specified are supported
[0609/175534.169694:INFO:crash_reporting.cc(247)] Crash reporting enabled for process: browser
[0609/175534.185260:WARNING:crash_reporting.cc(286)] Failed to set crash key: UserID with value: 0
[0609/175534.185307:WARNING:crash_reporting.cc(286)] Failed to set crash key: BuildID with value: 1623191035
[0609/175534.185314:WARNING:crash_reporting.cc(286)] Failed to set crash key: SteamUniverse with value: Public
[0609/175534.185320:WARNING:crash_reporting.cc(286)] Failed to set crash key: Vendor with value: Valve
/usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so: undefined symbol: g_log_structured_standard
Failed to load module: /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will not be saved or shared with other applications.
[0609/175534.254117:WARNING:crash_reporting.cc(286)] Failed to set crash key: UserID with value: 0
[0609/175534.254168:WARNING:crash_reporting.cc(286)] Failed to set crash key: BuildID with value: 1623191035
[0609/175534.254175:WARNING:crash_reporting.cc(286)] Failed to set crash key: SteamUniverse with value: Public
[0609/175534.254180:WARNING:crash_reporting.cc(286)] Failed to set crash key: Vendor with value: Valve
[0609/175534.254633:INFO:crash_reporting.cc(247)] Crash reporting enabled for process: gpu-process
[0609/175534.401629:WARNING:crash_reporting.cc(286)] Failed to set crash key: UserID with value: 0
[0609/175534.401676:WARNING:crash_reporting.cc(286)] Failed to set crash key: BuildID with value: 1623191035
[0609/175534.401680:WARNING:crash_reporting.cc(286)] Failed to set crash key: SteamUniverse with value: Public
[0609/175534.401683:WARNING:crash_reporting.cc(286)] Failed to set crash key: Vendor with value: Valve
[0609/175534.402177:INFO:crash_reporting.cc(247)] Crash reporting enabled for process: utility
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
CAppInfoCacheReadFromDiskThread took 36 milliseconds to initialize
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)

(steam:123944): GLib-GObject-CRITICAL **: 17:55:35.098: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
CApplicationManagerPopulateThread took 68 milliseconds to initialize (will have waited on CAppInfoCacheReadFromDiskThread)
Installing breakpad exception handler for appid(steam)/version(1623193086)
Proceed to auto login
Installing breakpad exception handler for appid(steam)/version(1623193086)
Installing breakpad exception handler for appid(steam)/version(1623193086)
src/public/tier1/utlmemory.h (176) : Assertion Failed: 0
src/public/tier1/utlmemory.h (176) : Assertion Failed: 0
Installing breakpad exception handler for appid(steam)/version(1623193086)
crash_20210609175535_21.dmp[124014]: Uploading dump (out-of-process)
/tmp/dumps/crash_20210609175535_21.dmp
src/public/tier1/utlvector.h (1208) : Assertion Failed: count >= 0
src/public/tier1/utlvector.h (1208) : Assertion Failed: count >= 0
double free or corruption (!prev)
assert_20210609175532_1.dmp[124017]: Uploading dump (out-of-process)
/tmp/dumps/assert_20210609175532_1.dmp