Missing libGLU.so.1

I’m trying to run a Game, but it won’t start. The error message is

error while loading shared libraries: libGLU.so.1: cannot open shared object file: No such file or directory

So I googeld it and could be installed by this command (although the KI said, that this file should already be installed on Bazzite):

sudo dnf install mesa-libGLU

but that one fails too. Error Message:

ERROR: Fedora Atomic images utilize rpm-ostree instead (and is discouraged to use).
Please, read our documentation
https://docs.bazzite.gg/Installing_and_Managing_Software/

F: Can’t find a11y bus: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program org.a11y.Bus: Permission denied
[2] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
Gtk-Message: 20:56:39.522: Failed to load module “colorreload-gtk-module”
ATTENTION: default value of option mesa_glthread overridden by environment.
[Parent 2, Main Thread] WARNING: Failed to create DBus proxy for org.a11y.Bus: Fehler beim Aufruf von StartServiceByName für org.a11y.Bus: Failed to execute program org.a11y.Bus: Permission denied
: ‘glib warning’, file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201

** (org.mozilla.firefox:2): WARNING **: 20:56:39.899: Failed to create DBus proxy for org.a11y.Bus: Fehler beim Aufruf von StartServiceByName für org.a11y.Bus: Failed to execute program org.a11y.Bus: Permission denied