Unsupported command-line flag: --no-sandbox

Tried to execute the commands you mentioned but did not resolve the issue. Philsophy-wise I don’t agree that users should fix by themselves what developers should, especially when security could (even remotely) be compromised. Still waiting for a definitive fix.

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Which distribution are you using?

Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
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This topic was automatically closed after 30 days. New replies are no longer allowed.

Sorry for anyone following this thread, it was auto-closed by the system. I’ve reopened it for further reporting/discussions. I’ll also be directing users/new reports of this issue to this thread for easier tracking.

Given the breadth of this issue, for anyone just now seeing this thread, it would be very helpful for us to include your Linux Distribution information in your reply. Additionally, for those of you who are already following this thread, please reply (or edit a previous reply you’ve made) with your distribution information as well.

We’re prepping to do a thorough investigation into a few prevalent Linux issues (this one included) that are blocking users from using Brave or using some functionality from within it. The larger the sample size of information we have the easier it will be to diagnose and/or implement solutions.
Thank you.


Hi, using ubuntu 18.04. Keep getting the “you are using an unsupported command line flag: --no sandbox. Stability and security will suffer.”

I acquired Brave from the Ubuntu software center. Any solutions?

Previous threads did not contain workable solutions for me. Also, wish Brave could have an option like Mozilla to automatically delete browser data; would save much time. Thanks

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Ubuntu 18.04.1 LTS. I snapped back last time the auto-update turned my world upside down and was happily rolling along with the old version. Today I find Brave has updated to Version 0.58.21, chucked all of my bookmarks and settings, disconnected my from my password manager, and requires that I re-trust every site for which I had lowered shields. This is very disappointing.

In other news, the sandbox flag error is gone, I think.


Hello, I’d like to first thank you for your time and attention to this issue. After installing the latest version of brave via snap store it has completely resolved the issue with the no sandbox flag. Thank you for your replies and professionalism in working to fix this problem. Very happy to be back using brave and Uninstalled opera browser with the quickness!

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In my case I am using:

Operating System: Manjaro Linux
KDE Plasma Version: 5.14.4
Qt Version: 5.12.0
KDE Frameworks Version: 5.53.0
Kernel Version: 4.19.13-1-MANJARO
OS Type: 64-bit

This message has always appeared.


Same. These updates haven’t done anything in regard to that in our end, contrary to other distros.

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I’m using Manjaro Gnome and have same issue. Brave is in the main repos but it’s updates have not fixed the problem.

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As mentioned in the comments on the answer of that superuser.com question, if you get the following error:

sysctl: cannot stat /proc/sys/kernel/unprivileged_userns_clone: No such file or directory

then you’re probably running a newer kernel version. The sysctl has since changed:

sudo sysctl user.max_user_namespaces=500 | sudo tee /etc/sysctl.d/00-local-userns.conf

Edit: Although the above sysctl commmand runs correctly, it doesn’t actually fix the problem with Brave - I still get the error about --no-sandbox.

just installed this on manjaro cinnamon from the community repo, version 0.60.45-1, running kernel 4.19.24

what does this issue actually do? is it not safe to use the browser like this or is this just more informational? just read a great article about switching to Brave at The Verge https://www.theverge.com/2019/3/4/18249623/brave-browser-choice-chrome-vivaldi-replacement-chromium
thought i would give it a try

I just started a fresh install and got this too

OS: Manjaro Linux x86_64
Kernel: 4.19.23-1-MANJARO
Brave version: 0.60.45

@dsturbd, @childishgiant - You both installed via snap/store/some app software, is that correct?

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well on manjaro, i installed it from the software center (pamac), not sure of any other way other than to use pacman -S brave, which would accomplish the same thing

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sudo pacman -S brave on the terminal for me. Yeah it’s the same.


I just want to reiterate that Brave only maintains the packages listed at https://brave-browser.readthedocs.io/en/latest/installing-brave.html#linux.


This means that the .pkg.tar.xz file from which pacman installs Brave for us was built solely by the unofficial maintainer, right?

Correct me if I’m wrong: stuff like this thread and this one could be redirected to them. Right?

EDIT: @Mattches @toml
Edit 2: Please, can someone just answer my question with a yes or a no??

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