prev/play/next keys don't work in Lubuntu

[Peppe_L-G]

Referrering this answer: http://askubuntu.com/a/372028/255935

I have Lubuntu 14.04 with Spotify 0.9.11.27.XXXXXXXXX. 

My previous, play and next keys don't work (nothing happends when I hit them and have Spotify running). When I test them in xev in a console, I get the following output:

KeyPress event, serial 48, synthetic NO, window 0x2c00001,
root 0xc7, subw 0x0, time 1991811, (-270,386), root:(390,412),
state 0x0, keycode 173 (keysym 0x1008ff16, XF86AudioPrev), same_screen YES,
XLookupString gives 0 bytes: 
XmbLookupString gives 0 bytes: 
XFilterEvent returns: False

KeyRelease event, serial 48, synthetic NO, window 0x2c00001,
root 0xc7, subw 0x0, time 1991816, (-270,386), root:(390,412),
state 0x0, keycode 173 (keysym 0x1008ff16, XF86AudioPrev), same_screen YES,
XLookupString gives 0 bytes: 
XFilterEvent returns: False

KeyPress event, serial 48, synthetic NO, window 0x2c00001,
root 0xc7, subw 0x0, time 1992260, (-270,386), root:(390,412),
state 0x0, keycode 172 (keysym 0x1008ff14, XF86AudioPlay), same_screen YES,
XLookupString gives 0 bytes: 
XmbLookupString gives 0 bytes: 
XFilterEvent returns: False

KeyRelease event, serial 48, synthetic NO, window 0x2c00001,
root 0xc7, subw 0x0, time 1992262, (-270,386), root:(390,412),
state 0x0, keycode 172 (keysym 0x1008ff14, XF86AudioPlay), same_screen YES,
XLookupString gives 0 bytes: 
XFilterEvent returns: False

KeyPress event, serial 48, synthetic NO, window 0x2c00001,
root 0xc7, subw 0x0, time 1992794, (-270,386), root:(390,412),
state 0x0, keycode 171 (keysym 0x1008ff17, XF86AudioNext), same_screen YES,
XLookupString gives 0 bytes: 
XmbLookupString gives 0 bytes: 
XFilterEvent returns: False

KeyRelease event, serial 48, synthetic NO, window 0x2c00001,
root 0xc7, subw 0x0, time 1992797, (-270,386), root:(390,412),
state 0x0, keycode 171 (keysym 0x1008ff17, XF86AudioNext), same_screen YES,
XLookupString gives 0 bytes: 
XFilterEvent returns: False

 so at least the computer seems to notice them.

Is this functionality dependent on some package included in Ubuntu, but not in Lubuntu?

[Peppe_L-G · Accepted solution]

After reading this, I got it working by doing the following:

1. In a terminal, run: sudo apt-get install mdbus2

2. Somewhere between <keyboard> and </keyboard> in ~/.config/openbox/lubuntu-rc.xml (you may need to have root privileges to edit this file, I don't know), add the following:

   <keybind key="XF86AudioPlay">
     <action name="Execute">
       <command>dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.PlayPause</command>
     </action>
   </keybind>
   <keybind key="XF86AudioStop">
     <action name="Execute">
       <command>dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Stop</command>
     </action>
   </keybind>
   <keybind key="XF86AudioNext">
     <action name="Execute">
       <command>dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Next</command>
     </action>
   </keybind>
   <keybind key="XF86AudioPrev">
     <action name="Execute">
       <command>dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Previous</command>
     </action>
   </keybind>

 Save and restart the computer (there might be a simpler way, I don't know), then will the hotkey buttons work.