Your system information

• Steam client version (build number or date): 14-March-2026
• Distribution (e.g. Ubuntu): SteamOS
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: AMD

Please describe your issue in as much detail as possible:

Expected result: steam should launch when run.

On Stable branch of updates, SteamWebHelper fails to start, leading to an infinite load and eventual crash. Instead of automatically launching steam as expected on bootup, it would hang then show the following error after 5-10 minutes:

After seeing that it was failing to load, I proceeded to kill all instances of steam with killall -9 steam and run it from the command line. I saw the following error message show up repeatedly, about every 5 seconds, during the loading process:

steamwebhelper.sh[10512]: Starting steamwebhelper under bootstrap steamrt steam runtime via: /home/deck/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
steamwebhelper.sh[10512]: CEF sandbox already disabled
steamwebhelper.sh[10512]: Starting steamwebhelper with steamrt steam runtime at /home/deck/.local/share/Steam/steamrt64/pv-runtime/steam-runtime-steamrt/_v2-entry-point
getopt: symbol lookup error: /usr/lib/libc.so.6: undefined symbol: __tunable_is_initialized, version GLIBC_PRIVATE

After this moved to beta branch to see if there were any updates available that could remedy this, no success.

Steam still works in Gaming Mode, thankfully.

Steps for reproducing this issue:

1. Update to most recent stable branch version of SteamOS.
2. Switch to desktop mode.