The SUID sandbox helper binary was found, but is not configured correctly

What issue or error are you experiencing?

Local WP will simply not start anymore. I upgraded yesterday and then worked with the new Local WP release just fine, but today it won’t start anymore.


System Details

  • Local Version: 10.1.1

  • Operating System (OS) and OS version: Ubuntu 26.04


Local Logs

The ~/.config/Local/local-lightning-verbose.log shows no new entries since normal operation yesterday. The system application log shows:

[9239:0714/143013.891646:FATAL:sandbox/linux/suid/client/setuid_sandbox_host.cc:166] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I’m aborting now. You need to make sure that /opt/Local/chrome-sandbox is owned by root and has mode 4755.

I found only one similar issue Local doesn't open on Debian - #2 by mwallace where the users solution was running sudo chmod 4755 /opt/Local/chrome-sandbox which in my case also fixed the problem.

But… why would this suddenly be needed if all was working fine until now? I only did an upgrade yesterday from 10.1.0 to 10.1.1 and restarted the app just fine after that. No other upgrades or system config changes. Then suddenly today it won’t run anymore? Weird…

This appears to be a known issue between Ubuntu and Electron-based apps @Rolf, but I’m glad you were able to get things working again!