There are some hiccups when using Flatpak on void, first is using the --user switch to avoid:
Warning: Flatpak system operation Deploy not allowed for user
To add the flathub remote is:
$ flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
and to install Jellyfin (or any other software):
flatpak install --user flathub org.jellyfin.JellyfinServer
If you get an error: Warning: Failed to get revokefs-fuse socket from system-helper: Unable to connect to system bus
You need to install and enable dbus:
xbps-install dbus
$ sudo ln -s /etc/sv/dbus/ /var/service
This error?
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.portal.Desktop was not provided by any .service files
Install:
sudo xbps-install xdg-desktop-portal