How to install Steam on Rocky Linux 8.10?

Operating System: Rocky Linux 8.10 (Green Obsidian)
Kernel: Linux 4.18.0-553.27.1.el8_10.x86_64
DE: Gnome Version 3.32.2

I installed Steam from Flathub with this command

flatpak install flathub com.valvesoftware.Steam

and this is what happen when I try to launch the app

$ flatpak run com.valvesoftware.Steam 
INFO:root:https://github.com/flathub/com.valvesoftware.Steam/wiki
INFO:root:Will set XDG dirs prefix to /home/tato/.var/app/com.valvesoftware.Steam
DEBUG:root:Checking input devices permissions
WARNING:root:Missing permissions for input devices
INFO:root:Overriding TZ to Asia/Jakarta
steam.sh[2]: Running Steam on org.freedesktop.platform 24.08 64-bit
steam.sh[2]: STEAM_RUNTIME is enabled automatically
setup.sh[49]: Steam runtime environment up-to-date!
steam.sh[2]: Error: The unofficial Steam Flatpak app now requires user namespaces to be
enabled.

Check that the bubblewrap executable used by Flatpak, usually
/usr/bin/bwrap or /usr/libexec/flatpak-bwrap, is not setuid root.

If the file /proc/sys/kernel/unprivileged_userns_clone exists, check that
it contains value 1.

If the file /proc/sys/user/max_user_namespaces exists, check that its
value is at least 100.

For more details, please see:
https://github.com/flatpak/flatpak/wiki/User-namespace-requirements

Maybe I can ask here too, why does my sudo dnf update looks like this?

Last metadata expiration check: 1:11:36 ago on Fri 15 Nov 2024 04:04:38 PM WIB.
Error: 
 Problem: cannot install the best update candidate for package kmod-nvidia-550.127.05-1.el8_10.elrepo.x86_64
  - package kmod-nvidia-340xx-1:340.108-24.el8.x86_64 from rpmfusion-nonfree-updates requires kmod-nvidia-340xx-4.18.0-425.3.1.el8.x86_64 >= 1:340.108-24.el8, but none of the providers can be installed
  - package kmod-nvidia-390xx-3:390.154-3.el8.x86_64 from rpmfusion-nonfree-updates requires kmod-nvidia-390xx-4.18.0-425.3.1.el8.x86_64 >= 3:390.154-3.el8, but none of the providers can be installed
  - package kmod-nvidia-3:550.127.05-1.el8.x86_64 from rpmfusion-nonfree-updates requires kmod-nvidia-4.18.0-513.5.1.el8_9.x86_64 >= 3:550.127.05-1.el8, but none of the providers can be installed
  - nothing provides kernel < 4.18.0-426.el8 needed by kmod-nvidia-340xx-4.18.0-425.3.1.el8.x86_64-1:340.108-24.el8.x86_64 from rpmfusion-nonfree-updates
  - nothing provides kernel < 4.18.0-426.el8 needed by kmod-nvidia-390xx-4.18.0-425.3.1.el8.x86_64-3:390.154-3.el8.x86_64 from rpmfusion-nonfree-updates
  - nothing provides kernel < 4.18.0-514.el8_9 needed by kmod-nvidia-4.18.0-513.5.1.el8_9.x86_64-3:550.127.05-1.el8.x86_64 from rpmfusion-nonfree-updates
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

I’ve been using --nobest to update but I don’t know if it’s the right thing to do or not.

I am complete Linux noob, just switched from Windows 10. Picked Rocky Linux 8 because Davinci Resolve supports Rocky Linux.