"Package not found error" when installing a new App or Accessory

/docs/users/faq-howto-troubleshooting/error-package-not-found/

This can happen if you haven’t updated your UBOS Device for some time. In this case, ubos-admin will attempt to install a Package that has been upgraded since your last update, and can’t find the old version.

Always execute ubos-admin update before installing a new App or Accessory.