Cursor 0.33.4 refuses to start on Kubuntu 24.04: "SUID sandbox helper binary was found, but is not configured correctly"

[meladoro]

1. If you can, please include a screenshot of your problem

Here it is, though it hardly makes sense in this case:

2. Please include the name of your operating system

As reported by lsb_release -a:

Distributor ID: Ubuntu
Description: Ubuntu 24.04 LTS
Release: 24.04
Codename: noble

Flavor is Kubuntu, though.

3. If you can, steps to reproduce are super helpful

• Download latest version of Cursor from cursor.sh, cursor-0.33.4x86_64.AppImage
• Run chmod u+x ./cursor-0.33.4x86_64.AppImage
• Run ./cursor-0.33.4x86_64.AppImage
• Cursor refuses to start with following error: [3940:0523/104843.586137:FATAL:setuid_sandbox_host.cc(158)] 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_cursorl2LAz7/chrome-sandbox is owned by root and has mode 4755. Trace/breakpoint trap (core dumped)

I appreciate any assistance. Thank you very much.

m.

[mostafa20220]

I have the same issue.
The only thing that worked for me was running the app image using the flag: --no-sandbox

I searched a lot for a solution to run it without the no-sandbox flag ... but found nothing useful yet.

I hope someone finds a better solution than the no-sandbox flag.

[Octahedron-Alum]

Same here.

[rehypothecation]

Having this issue too.

[0xlidar]

This happens after Ubuntu 24.04

To resolve this issue, cursor developers need to add an apparmor profile like this mullvad/mullvadvpn-app#6196

[dushmanta05]

Same issue with me Ubuntu 24.04

[helgster77]

I have the same sandbox issue on Ubuntu 24.04 and if I run with "--no-sandbox" the UI starts up but I get SQL Lite errors and some others. Has anyone solved these problems and can share step by step instructions? Given all the hype about Cursor I'm kind of surprised, Ubuntu is not exactly a niche operating system.

[dushmanta05]

@helgster77 I've exactly same issue on my Ubuntu 24.04

[Imobacho]

Same here

[jurjendevries]

Same with Ubuntu 24.04. I am able to run it a bit with --no-sandbox, but it crashes randomly.

[Buckler89]

Same here with ubuntu 24.04

[nettum]

I just updated from 22.04 to 24.04 and get the same error.
As far as I can see there are at least a few issues regarding this - this one, #1483 and #1683

[nettum]

FWIW, as far as I can see vscode runs with the --no-sandbox flag, at least when you download the snap.
See diff between old and fixed version and a later a commit to change where --no-sandbox is defined

Edit:

I also tried to add my own AppArmor file, which I guess is a more secure fix. This needs to fixed by the authors of cursor for a permanent fix, but for the record I did the following:
Add a cursor-profile to /etc/apparmor.d:

# This profile allows everything and only exists to give the
# application a name instead of having the label "unconfined"

abi <abi/4.0>,
include <tunables/global>

profile cursor <your-path-to-cursor>/cursor*.AppImage flags=(unconfined) {
  userns,

  # Site-specific additions and overrides. See local/README for details.
  include if exists <local/cursor>
}

You need to change <your-path-to-cursor> and <version-flags>

Reload AppArmor service with sudo systemctl reload apparmor.service and check if everything is ok with sudo systemctl status apparmor.service.
You should now be able to run cursor without using --no-sandbox.
I have not tested cursor much after this change, so I don't know if there are any bugs or if the apparmor profile would need more adjustments.

Edit 2: Seems like @arpagon already suggested a similar fix in another issue

Edit 3: Edited apparmor code to use cursor*.AppImage (same as the example linked to above) instead of cursor-<version-flags>.AppImage as the latter will not work after AppImage updates.

[luisriverag]

Same here with ubuntu 24.04

Ubuntu 24.04.1. Same from CLI, but does start from GUI

[Livia-Zaharia]

It is caused by messed up pemissions in AppImage, my workaround is #1907