Apparmor don't let me open my Web Browser

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Maybe it happened when I did a new install to update my base for 24.04, I don’t know because I only tried to open Vivaldi-Snapshot after updating it to the new version.

Despite having the repositories enabled, I’m not receiving any updates to Vivaldi, both Stable and Snapshot, that’s why I got the .DEB from their site and installed it manually.

Asking around Vivaldi devs found a solution, type this in the Terminal: printf ‘abi <abi/4.0>,\ninclude <tunables/global>\nprofile vivaldi-sandbox /opt/vivaldi*/vivaldi-bin flags=(unconfined) {userns,}\n’ | sudo tee /etc/apparmor.d/vivaldi-sandbox >/dev/null && sudo systemctl restart apparmor.service

Worked, but now the situation is reversed. Snapshot opens but Stable down.

When I try to open Vivaldi from the terminal it says this: [2997:2997:1106/194628.762436:FATAL:credentials.cc(132)] Check failed: . : Permission denied (13)
Trace/breakpoint trap (core dumped)

And this appears on /var/log/syslog: kernel: audit: type=1400 audit(1730828611.552:2003): apparmor=“DENIED” operation=“userns_create” class=“namespace” info=“User namespace creation restricted” error=-13 profile=“unconfined” pid=103338 comm=“vivaldi-bin” requested=“userns_create” denied=“userns_create”

I could keep using the Snapshot, if not for the problem that there’s a problem with Sync not being able to send updates to the server.

How I use that same command that made the Snapshot work to make the Stable work again?

What even is Apparmor?

Why the Vivaldi’s public keys are not being accepted?

2
  1. This sounds like a bug in the Vivaldi package, and it sounds like you are already in discussions with the Vivaldi developers, so they should give you a solution that works, and not a partial solution.
  2. I would check the path in the AppArmor profile - is the path /opt/vivaldi*/vivaldi-bin matches both Vivaldi snapshot and stable?
  3. AppArmor is a Mandatory Access Control system, one of the two such security systems in Linux - the other one being SELinux. AppArmor is used on Ubuntu based operating systems. If you don’t value your system’s security - you can turn it off by running sudo systemctl disable --now apparmor.service - though as you are running applications installed from the internet not through your operating system’s software repositories, I highly recommend that you keep it on.
  4. I’m not sure why you think that Vivaldi’s public keys are not being accepted - you didn’t mention anything like that before the last line of your message.
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And just one other point there - Vivaldi publishes an official Snap package that might be of help on Ubuntu-based Linux distributions: