Flatpak is a cross-distribution framework for distribution and running of sandboxed applications. XDG Desktop Portal provides Nuvola Apps with desktop integration. KDE Discover and GNOME Software make the browsing and installation of Flatpaks easier.
All required packages are available in OpenSUSE repositories, run following commands as root/sudo to install them:
zypper install flatpak xdg-desktop-portal xdg-desktop-portal-kde discover
zypper install flatpak xdg-desktop-portal xdg-desktop-portal-gtk gnome-software
Then restart your computer to add Flatpak paths alongside the system ones. Otherwise, you may see strange errors. Unfortunately, just logging out and logging in is not enough.
The Flathub repository provides GNOME Platform runtime, which is used by Nuvola to share common dependencies with other Flatpak apps to reduce disk & memory usage. The Nuvola Apps repository contains Nuvola Apps Service and individual Nuvola web apps.
Finally, refresh the database of packages: Launch KDE Discover → switch to the Updates section → click the Check for Updates button in the top right corner.
Finally, refresh the database of packages: Launch GNOME Software → switch to the Updates screen → click the Refresh button in the top left corner.
Launch a Linux terminal emulator and run following commands:
flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --if-not-exists nuvola https://dl.tiliado.eu/flatpak/nuvola.flatpakrepo
Nuvola Apps Service is an optional background service that provides individual Nuvola apps with global shared resources such as a global configuration storage, global keyboard shortcuts, a HTTP remote control server, and a command-line controller. While this service is optional, the installation is recommended.
In order to install Nuvola Apps Service with KDE Discover, launch KDE Discover, search for Nuvola Apps Service and finally click the Install button.
In order to install Nuvola Apps Service with GNOME Software, launch GNOME Software, search for Nuvola Apps Service and finally click the Install button.
Alternatively, launch a Linux terminal emulator and run a following command:
flatpak install nuvola eu.tiliado.Nuvola