Linux Kubuntu No Sandbox

[orangelightening]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Surf Version

Surf-1.4.0-beta.0.x86_64.AppImage

What operating system(s) are you using?

Ubuntu

Operating System Version

kubuntu 25.10

What arch are you using?

None

Expected Behavior

I expected the Appimage to execute once I had changed the permission to execute.

Actual Behavior

peter@peter-hpz440workstation:~/surf$ ./Surf-1.4.0-beta.0.x86_64.AppImage
[258929:1126/104552.026896: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 /tmp/.mount_Surf-1gtRqTg/chrome-sandbox is owned by root and has mode 4755.
Trace/breakpoint trap (core dumped)

Additional Information

Either I am an outlier or this is untested code.