# AppImage run fails without --no-sandbox on Linux

**URL:** <https://forum.cursor.com/t/appimage-run-fails-without-no-sandbox-on-linux/168960>\
**Category:** Bug Reports\
**Tags:** linux, crashes, installation\
**Created:** [August 20, 2026, 11:16am UTC](https://forum.cursor.com/t/appimage-run-fails-without-no-sandbox-on-linux/168960 "2026-08-20T11:16:17Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![klntsky](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/klntsky/32/64260_2.png) [@klntsky](https://forum.cursor.com/u/klntsky)\
**Post date:** [August 20, 2026, 11:16am UTC](https://forum.cursor.com/t/appimage-run-fails-without-no-sandbox-on-linux/168960/1 "2026-08-20T11:16:17Z")

</div>

### Where does the bug appear (feature/product)?

Cursor IDE

### Describe the Bug

```auto
➜ ~ ~/Downloads/Cursor-3.7.42-x86_64.AppImage
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
[666572:0820/151432.372846:FATAL:content/browser/zygote_host/zygote_host_impl_linux.cc:207] Check failed: . : Invalid argument (22)
[1] 666572 trace trap (core dumped) ~/Downloads/Cursor-3.7.42-x86_64.AppImage

```

### Steps to Reproduce

Run the appimage distribution on ubuntu

### Expected Behavior

.

### Operating System

Linux

### Version Information

Version: 3.15.6  
VS Code Extension API: 1.128.0  
Commit: a1f686545fd0ce8917bbd2449f733551a9bce420  
Date: 2026-08-06T01:41:03.876Z  
Layout: IDE  
Build Type: Stable  
Release Track: Default  
Electron: 40.10.3  
Chromium: 144.0.7559.236  
Node.js: 24.15.0  
V8: 14.4.258.32-electron.0  
xterm.js: 6.1.0-beta.291  
OS: Linux x64 6.8.0-106-generic

### Does this stop you from using Cursor

No - Cursor works, but with this issue

---

<div class="post-metadata">

**Author:** ![deanrie](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/deanrie/32/1263_2.png) [@deanrie](https://forum.cursor.com/u/deanrie)\
**Post date:** [August 20, 2026, 12:51pm UTC](https://forum.cursor.com/t/appimage-run-fails-without-no-sandbox-on-linux/168960/5 "2026-08-20T12:51:43Z")

</div>

Hey, thanks for the detailed report. This is a known issue we’re tracking. Newer Ubuntu releases 24.04+ restrict unprivileged user namespaces by default, and the AppImage FUSE mount is `nosuid`. As a result, both Chromium sandbox options aren’t available, so the process crashes on startup.

Options until we have a proper fix:

- Install Cursor from the `.deb` package instead of the AppImage. It integrates with the system and the sandbox works normally.
- Allow user namespaces: `sudo sysctl kernel.apparmor_restrict_unprivileged_userns=0` (note this lowers overall system security).
- Keep launching with `--no-sandbox`, like you’re doing now.

I can’t share an ETA yet, but I’ll post in the thread when there’s an update.