couldn't start Hyper 3.4.1: `FATAL:setuid_sandbox_host.cc`

• I am on the latest Hyper.app version
• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: Ubuntu 24.04.2
• Hyper.app version: 3.4.1 (AppImage)
• Link of a Gist with the contents of your hyper.json: https://gist.github.com/w3ntao/7e61e0f75a8d72b925bebe87abe325f5
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere):
• The issue is reproducible in vanilla Hyper.app:

Issue

couldn't start Hyper-3.4.1.AppImage from terminal, got error:

[4348:0521/211822.779171:FATAL:setuid_sandbox_host.cc(157)] 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_Hyper-lWQyci/chrome-sandbox is owned by root and has mode 4755.
fish: Job 1, './Hyper-3.4.1.AppImage' terminated by signal SIGTRAP (Trace or breakpoint trap)

It has been working fine for a while and suddenly I couldn't start it. Can someone help me out of this?

Start by reproducing Hyper-3.4.1.AppImage on Ubuntu 24.04.2 and inspect the chrome-sandbox path and permissions shown in the fatal error. Review the AppImage startup and packaging configuration, using the linked hyper.json as context. Done means the packaged app starts without the setuid sandbox failure.