Fedora 43 Atomic Desktops Post-Install Guide (2026) – Top Tweaks, Flatpak Setup & Essential Tips

Let’s go straight to the point and get started.

Update

Update your system to latest package

rpm-ostree update

Update flatpak apps

flatpak update -y

Update firmware

sudo fwupdmgr refresh
sudo fwupdmgr get-updates
sudo fwupdmgr update

Enable Flatpak & Flathub

Fedora 43 already includes Flatpak, just add Flathub:

sudo flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Install your favourite apps

flatpak install flathub com.brave.Browser com.spotify.Client org.videolan.VLC com.discordapp.Discord

[Experimental] Install apps as systemd extension

Fedora developers are working on experimental features. Which might be included in future. There’s no downside for testing this now. It let’s us install and use apps that doesn’t work with flatpak. And I don’t want to layer apps. It is called Systemd extension. We can install zsh, steam-devices or openh264.
You might want to check this site - fedora-sysexts

Default firefox can’t play h264 video playback. So, we can install openh264 First time setup

sudo install -d -m 0755 -o 0 -g 0 /var/lib/extensions /var/lib/extensions.d
sudo restorecon -RFv /var/lib/extensions /var/lib/extensions.d
sudo systemctl enable --now systemd-sysext.service

Install openh264

install_sysext() {
  SYSEXT="${1}"
  URL="https://extensions.fcos.fr/community"
  sudo install -d -m 0755 -o 0 -g 0 /etc/sysupdate.${SYSEXT}.d
  sudo restorecon -RFv /etc/sysupdate.${SYSEXT}.d
  curl --silent --fail --location "${URL}/${SYSEXT}.conf" \
    | sudo tee "/etc/sysupdate.${SYSEXT}.d/${SYSEXT}.conf"
  sudo /usr/lib/systemd/systemd-sysupdate update --component "${SYSEXT}"
}

You might want to checkout full guide

Similarly, you can install apps that are available in the repo.
Official fedora repo
Fedora community repo

Enable magic SysRq - REISUB

To enable the SysRq key functionality, add the following line to the /etc/sysctl.d/90-sysrq.conf file:

kernel.sysrq = 1

In case your system freezes, you can safely reboot it using the REISUB sequence:

1. Hold down Alt + SysRq (Print Screen key).
2. While holding them, type the following keys in order: R, E, I, S, U, B.

Install brew

Brew from Macos now works with linux. If you are from mac world. You should be at home. Check out How to install Homebrew (Brew / LinuxBrew) in Fedora Silverblue & Kinoite for more about installing Linuxbrew.

Mount Drives permanently

You many want to mount external drivers.

check uuid of the drive you want to mount permanently

lsblk -f

add uuid in /etc/fstab at the last line

UUID=0d8130f6-ad5a-4df7-9c44-5001f3a950d8 /home/my_user_name/data   ext4    defaults,noatime,x-gfvs-show 0 0

Gaming

For gaming on Fedora atomic there are many ways. Check my other posts. Setup Gaming Environment for Fedora Silverblue & Kinoite