I have a Lenovo Thinkpad T440s on which I was previously running Ubuntu 18.04 and now Ubuntu 20.04.

One day last week Steam just stopped working. It performs verification as normal and then just stops. When I launch it from terminal I get the following output:

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/user/.steam/debian-installation/ubuntu12_32/steam -nominidumps -nobreakpad

[2021-06-17 10:42:19] Startup - updater built Jun  8 2021 22:23:36

Looks like steam didn't shutdown cleanly, scheduling immediate update check

[2021-06-17 10:42:19] Using the following download hosts for Public, Realm steamglobal

[2021-06-17 10:42:19] 1. https://cdn.cloudflare.steamstatic.com, /client/, Realm 'steamglobal', weight was 100, source = 'update_hosts_cached.vdf'

[2021-06-17 10:42:19] 2. https://cdn.akamai.steamstatic.com, /client/, Realm 'steamglobal', weight was 100, source = 'update_hosts_cached.vdf'

[2021-06-17 10:42:19] 3. http://media.steampowered.com, /client/, Realm 'steamglobal', weight was 1, source = 'baked in'

[2021-06-17 10:42:19] Checking for update on startup

[2021-06-17 10:42:19] Checking for available updates...

[2021-06-17 10:42:19] Downloading manifest: https://cdn.cloudflare.steamstatic.com/client/steam_client_ubuntu12

[2021-06-17 10:42:20] Download skipped: /client/steam_client_ubuntu12 version 1623193086, installed version 1623193086, existing pending version 0

[2021-06-17 10:42:20] Nothing to do

[2021-06-17 10:42:20] Verifying installation...

[2021-06-17 10:42:20] Performing checksum verification of executable files

[2021-06-17 10:42:20] Verification complete

STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy

And then it silently dies. I have tried updating to Ubuntu 20.04, reinstalling steam, updating drivers etc. (every other solution I found on here which are mostly to do with dedicated graphics cards misbehaving). Reinstalling steam would work once and then this problem would reappear when I closed steam and attempted to re-open it.

Does anyone have any insight into this problem or a work around for launching tabletop sim (the only game I play on this machine). I really really don't want to totally wipe the machine and reinstall the OS since this is also my work machine since the pandemic started and I don't want to have to reinstall all my ssh keys, dev software etc.

Thanks

Update

The error.log file in ~/.steam/debian-installation reports the following:-

nstalling 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)

Loaded SDL version 2.0.15-6501165

Gtk-Message: 11:31:50.628: Failed to load module "gail"

Gtk-Message: 11:31:50.628: Failed to load module "atk-bridge"



(steam:23234): Gtk-WARNING **: 11:31:50.631: Unable to locate theme engine in module_path: "adwaita",

/usr/share/themes/Yaru/gtk-2.0/main.rc:775: error: unexpected identifier 'direction', expected character '}'



(steam:23234): Gtk-WARNING **: 11:31:50.632: Unable to locate theme engine in module_path: "adwaita",

/usr/share/themes/Yaru/gtk-2.0/hacks.rc:28: error: invalid string constant "normal_entry", expected valid string constant

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)

[0617/113151.042040:INFO:crash_reporting.cc(247)] Crash reporting enabled for process: browser

[0617/113151.062779:WARNING:crash_reporting.cc(286)] Failed to set crash key: UserID with value: 0

[0617/113151.062852:WARNING:crash_reporting.cc(286)] Failed to set crash key: BuildID with value: 1623191035

[0617/113151.062858:WARNING:crash_reporting.cc(286)] Failed to set crash key: SteamUniverse with value: Public

[0617/113151.062862: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.

[0617/113151.102489:WARNING:crash_reporting.cc(286)] Failed to set crash key: UserID with value: 0

[0617/113151.102562:WARNING:crash_reporting.cc(286)] Failed to set crash key: BuildID with value: 1623191035

[0617/113151.102568:WARNING:crash_reporting.cc(286)] Failed to set crash key: SteamUniverse with value: Public

[0617/113151.102573:WARNING:crash_reporting.cc(286)] Failed to set crash key: Vendor with value: Valve

[0617/113151.104725:INFO:crash_reporting.cc(247)] Crash reporting enabled for process: gpu-process

[0617/113151.134901:ERROR:sandbox_linux.cc(372)] InitializeSandbox() called with multiple threads in process gpu-process.

[0617/113151.169299:WARNING:crash_reporting.cc(286)] Failed to set crash key: UserID with value: 0

[0617/113151.169369:WARNING:crash_reporting.cc(286)] Failed to set crash key: BuildID with value: 1623191035

[0617/113151.169375:WARNING:crash_reporting.cc(286)] Failed to set crash key: SteamUniverse with value: Public

[0617/113151.169379:WARNING:crash_reporting.cc(286)] Failed to set crash key: Vendor with value: Valve

[0617/113151.170013: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)

CApplicationManagerPopulateThread took 0 milliseconds to initialize (will have waited on CAppInfoCacheReadFromDiskThread)

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 111 milliseconds to initialize

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)

Proceed to auto login

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_20210617113151_22.dmp[23331]: Uploading dump (out-of-process)

/tmp/dumps/crash_20210617113151_22.dmp

src/public/tier1/utlvector.h (1216) : Assertion Failed: !pArray || (Base() >= (pArray + size)) || (pArray >= (Base() + Count()) )

src/public/tier1/utlvector.h (1216) : Assertion Failed: !pArray || (Base() >= (pArray + size)) || (pArray >= (Base() + Count()) )

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_20210617113149_1.dmp[23334]: Uploading dump (out-of-process)

/tmp/dumps/assert_20210617113149_1.dmp

/home/user/.steam/debian-installation/steam.sh: line 772: 23234 Aborted                 (core dumped) $STEAM_DEBUGGER $DEBUGGER_ARGS "$STEAMROOT/$STEAMEXEPATH" "$@"

crash_20210617113151_22.dmp[23331]: Finished uploading minidump (out-of-process): success = yes

crash_20210617113151_22.dmp[23331]: response: CrashID=bp-9536b9bc-be97-4003-ae61-4bc482210617

crash_20210617113151_22.dmp[23331]: file ''/tmp/dumps/crash_20210617113151_22.dmp'', upload yes: ''CrashID=bp-9536b9bc-be97-4003-ae61-4bc482210617''

assert_20210617113149_1.dmp[23334]: Finished uploading minidump (out-of-process): success = yes

assert_20210617113149_1.dmp[23334]: response: CrashID=bp-ffdda10e-c1ba-4dbd-acf2-feaa92210617

assert_20210617113149_1.dmp[23334]: file ''/tmp/dumps/assert_20210617113149_1.dmp'', upload yes: ''CrashID=bp-ffdda10e-c1ba-4dbd-acf2-feaa92210617''