simon@simon ~ $ flatpak run chat.delta.desktop
F: Can’t get document portal: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying
[2 zypak-helper] Failed to connect to session bus: [org.freedesktop.DBus.Error.NotSupported] Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
[2 zypak-helper] src/helper/main.cc:42(DetermineZygoteStrategy): Assertion failed: bus
I use redcore linux if that helps