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Launching the Audacious audio player from the command line yields the following error:

$ audacious 
ERROR dbus-server.cc:928 [dbus_server_init]: D-Bus error: Cannot autolaunch D-Bus without X11 $DISPLAY
ERROR pulse_audio.cc:439 [create_context]: pa_context_connect() failed: Connection refused
WARNING plugin-init.cc:110 [start_plugin]: PulseAudio Output failed to start.
ERROR plugin.cc:310 [init]: Cannot autolaunch D-Bus without X11 $DISPLAY
WARNING plugin-init.cc:110 [start_plugin]: MPRIS 2 Server failed to start.

(audacious:42484): Gtk-WARNING **: 21:18:52.181: cannot open display: 
WARNING main.cc:328 [main_cleanup]: exit() called unexpectedly; skipping normal cleanup.

Launching Audacious from the dash works without any problems, as well as opening files with it or starting it from the context menu in Nautilus.

Oehm
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1 Answers1

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Ubuntu 21.04 starts Wayland by default. So you got no X11 $DISPLAY.

In you login screen is a small cog on the right side,

[1]

change it to "Ubuntu" an login again...

kanehekili
  • 6,402
  • Thanks, @kanehekili! So this means, Audacious is not compatible with Wayland? Or is it a general Ubuntu problem? Why does launching via the other mentioned methods work? – Oehm May 24 '21 at 08:20
  • The Menu looks different on my installation: only two entries - "Ubuntu" and "Ubuntu on Xorg". Selecting the latter indeed fixed the issue. – Oehm May 24 '21 at 08:24
  • Sorry, that is what I meant: with 21.04 Wayland is default and X11 only the backup. (Picture is from 20.04) Audacious is compatible with wayland as it uses GTK3 - which must support wayland. But "dbus" (the interprocess communication) can't reach X11 anymore - thus can't start the app from terminal in order to pass a display. – kanehekili May 24 '21 at 21:02
  • Thanks for the explanation! Still I wonder: What must happen to make launching Audacious from the terminal work again on Ubuntu using Wayland? Who has to fix what? I suppose other apps are affected too, and launching from the command line is still a supported feature? – Oehm May 25 '21 at 08:21