I don't know if this is a standard error or a error of my config.
what i changed:
i copied everything von /snap in /programs/snap
Then i added to /etc/fstab
/programs/snap /snap none bind 0 0
When someone uses a guest user and try to start firefox/chromium it didn't open.
if you start them in a terminal you get this error:
2022/05/03 08:54:29.259625 tool_linux.go:82: cannot open snapd info file "/snap/snapd/current/usr/lib/snapd/info": open /snap/snapd/current/usr/lib/snapd/info: permission denied