Sandbox error; programs won't run

[david12]

I woke up this morning to find that upon starting, my computer would not run certain programs. Here are the cases:

1. Brave

david@david-ubuntu01:~$ sudo brave-browser
[sudo] password for david:
[3571:3571:0508/072450.537344:ERROR:zygote_host_impl_linux.cc(99)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.

2. Tuta via AppImage

david@david-ubuntu01:~/applications$ ./tutanota-desktop-linux_0d66b91d4546d31f933693cf28579c01.AppImage
[4310:0508/072816.249466: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_tutanoRuG14C/chrome-sandbox is owned by root and has mode 4755.
[appimagelauncher-binfmt-bypass/lib] ERROR: child exited with code 5

As far as I can remember, these programs worked without hesitation two days ago, which was the last time this computer ran.
I am running Ubuntu 24.04
I've no idea what is going on here, your kind suggestions would be most appreciated. Thanks.

[currentshaft]

Why are you running your web browser as root? In terms of information security practices, this is one of the worst things you can do ... or attempt to do.

[david12]

Until this morning I launched Brave from the GNOME GUI as a normal user. But now Brave will not launch, nor will some other stuff. In an attempt to get at what the error might be, and perhaps overcome it, I tried to launch Brave for the command line as root. It generated the error shown. I also spoke harshly to my computer and shook it like a pinball machine. Nothing, so far,

Please, do you have any idea what might be causing these errors?

[currentshaft]

Until this morning I launched Brave from the GNOME GUI as a normal user. But now Brave will not launch, nor will some other stuff. In an attempt to get at what the error might be, and perhaps overcome it, I tried to launch Brave for the command line as root. It generated the error shown. I also spoke harshly to my computer and shook it like a pinball machine. Nothing, so far,

Please, do you have any idea what might be causing these errors?

The errors should give an indication.

The first one is "Running as root without --no-sandbox is not supported. " so just try running brave-browsers without sudo.

The second command says "You need to make sure that /tmp/.mount_tutanoRuG14C/chrome-sandbox is owned by root and has mode 4755." - so check the file/directory to see what it's being set to instead. Do you have a custom umask set in your shell? Have you tried re-downloading the AppImage and running it again?

[1fallen]

Please run this and paste back the return, using Code Tags Please:

brave-browser

It might shed some light, and please don't run a browser with "sudo"

Ninja'd by currentshaft

[david12]

brave-browser

This neither starts the program, nor returns anything at all... just blank.

google-chrome-stable

Likewise, Nada.

[1fallen]

Interesting nothing at all???
Please show this now:
EDIT: I was on Arch so I fixed the code below

stat /usr/bin/brave-browser

Should look like this.

  File: /usr/bin/brave
  Size: 348       	Blocks: 8          IO Block: 4096   regular file
Device: 8,18	Inode: 9571574     Links: 1
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2024-05-08 11:20:05.000000000 -0600
Modify: 2024-05-08 11:19:01.000000000 -0600
Change: 2024-05-08 11:20:05.695397175 -0600
 Birth: 2024-05-08 11:20:05.695397175 -0600

[david12]

-rwxr-xr-x 1 david david 123506095 May 2 21:24 tutanota-desktop-linux_0d66b91d4546d31f933693cf28579c01.AppImage

As I mentioned above, when I shut my computer down two days ago, everything was working fine. I have used this AppImage often and repeatedly. I have not set umask; I have not re-downloaded the AppImage.

[david12]

david@david-ubuntu01:~/applications$ stat /usr/bin/brave
stat: cannot statx '/usr/bin/brave': No such file or directory

david@david-ubuntu01:~/applications$ locate brave
/etc/alternatives/brave-browser
/etc/apparmor.d/brave
/etc/apt/sources.list.d/brave-browser-release.list
/etc/cron.daily/brave-browser
/etc/default/brave-browser
/etc/sysctl.d/30-brave.conf
.....and many, many lines of info thereafter

I think something may be really, really broken here.

[1fallen]

I missed that part for Appimage, after reading the errors shown can you try with a flag "--disable-gpu-sandbox" at the end of your command.