Flatpak (pkg) is a cross-distribution framework for distribution and running of sandboxed applications. XDG Desktop Portal (pkg1, pkg2) provides Nuvola Player with desktop integration. GNOME Software with Flatpak plugin (pkg1, pkg2) makes the browsing and installation of Flatpaks easier.
All packages are available in the Debian repositories. Run the commands below as root/sudo. Then restart your computer to add Flatpak paths alongside the system ones and to activate the GNOME Software Flatpak plugin. Otherwise, you may see strange errors. Unfortunately, just logging out and logging in is not enough.
apt install flatpak xdg-desktop-portal-gtk gnome-software gnome-software-plugin-flatpak
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 Player repository contains Nuvola Player Service and individual integration scripts.
Refresh GNOME Software package cache: Launch GNOME Software → switch to the Updates screen → click the Refresh button in the top left corner.
Alternatively, launch a Linux terminal emulator,
type 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,
and flatpak update.
Nuvola Player Service is an optional background service that provides integration scripts 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 Player Service with GNOME Software, launch GNOME Software, search for Nuvola Player Service and finally click the Install button.
Alternatively, launch a Linux terminal emulator,
type flatpak install nuvola eu.tiliado.Nuvola and press the Enter key to install this package.