sudo bash -c "$(curl -sL https://raw.githubusercontent.com/patrikaeberli/viewer/refs/heads/main/install.sh)"
sudo systemctl restart signage-kiosk
depending on your version you need to change "chromium-browser" to just "chromium" in /home/kiosk/.config/openbox/autostart.
sudo nano /home/kiosk/.config/openbox/autostart