Cannot Open Brave due to SUID sanbox helper binary

[blueOkiris]

When I try to run the latest stable, 1.74, I get this error:

[96040:96040:0118/231118.719833:FATAL:setuid_sandbox_host.cc(163)] 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_Brave-IKClMi/chrome-sandbox is owned by root and has mode 4755. 

Obviously, I can start via --no-sandbox, but that's really annoying.

I'm on Ubuntu Studio 24.04 using KDE as my DE

[blueOkiris]

I can extract the AppImage via --appimage-extract do

• sudo chown root:$(whoami) squashfs-root/chrome-sandbox
• sudo chmod 4755 squashfs-root/chrome-sandbox

And then run ./squashfs-root/brave without issue.

However, if I use AppImage tool: ./appimagetool-x86_64.AppImage squashfs-root/ to repackage it, it fails after that:

/tmp/.mount_Brave-MDmCek
The setuid sandbox is not running as root. Common causes:
  * An unprivileged process using ptrace on it, like a debugger.
  * A parent process set prctl(PR_SET_NO_NEW_PRIVS, ...)
Failed to move to new namespace: PID namespaces supported, Network namespace supported, but failed: errno = Operation not permitted
[4729:4729:0126/170324.392406:FATAL:zygote_host_impl_linux.cc(207)] Check failed: . : No such file or directory (2)
Trace/breakpoint trap (core dumped)

Perhaps that info can get some progress on this.