Your system information

• Steam client version (build number or date): 1572467527
• Distribution (e.g. Ubuntu): Debian Sid
• 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:

Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist

Steam refused to launch. I have tried -tcp and STEAM_RUNTIME=0, both not working.

Steps for reproducing this issue:

1. Launch Steam, both via the menu and via steam in the terminal.
2. It will download and install updates just fine.
3. It silently quits.

Terminal output:

pthfdr:/u/h/pthfdr>steam
Running Steam on debian  64-bit
STEAM_RUNTIME is enabled automatically
Pins up-to-date!
[2019-11-03 09:25:00] Startup - updater built Oct 30 2019 20:05:18
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[2019-11-03 09:25:00] Checking for update on startup
[2019-11-03 09:25:00] Checking for available updates...
[2019-11-03 09:25:00] Downloading manifest: client-download.steampowered.com/client/steam_client_ubuntu12
[2019-11-03 09:25:00] Download skipped: /client/steam_client_ubuntu12 version 1572467527, installed version 1572467527
[2019-11-03 09:25:00] Nothing to do
[2019-11-03 09:25:00] Verifying installation...
[2019-11-03 09:25:00] Performing checksum verification of executable files
[2019-11-03 09:25:01] Verification complete
STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy

dmesg:

[39007.822248] CIPCServer::Thr[18194]: segfault at 88 ip 00000000eb4239f6 sp 00000000e064d600 error 4 in libdbus-1.so.3.5.8[eb418000+48000]
[39007.822258] Code: 00 00 00 00 83 ec 2c 89 74 24 28 8b 74 24 30 89 5c 24 24 e8 c3 9f ff ff 81 c3 24 d2 03 00 85 f6 74 70 8b 83 7c 03 00 00 8b 10 <39> 96 8c 00 00 00 75 1a 89 34 24 e8 ea 34 02 00 89 f0 8b 5c 24 24

Dump file:
assert_20191103092500_1.dmp.gz