em 17.04, os comandos de volume padrão não funcionarão, porque em ~ / .config / openbox / lubuntu-rc.xml o comando amixer está errado. Para corrigi-lo, localize as marcas-chave "XF86Audio"
<keybind key="XF86AudioRaiseVolume">
<action name="Execute">
<command>amixer -q sset Master 3%+ unmute</command>
</action>
</keybind>
<keybind key="XF86AudioLowerVolume">
<action name="Execute">
<command>amixer -q sset Master 3%- unmute</command>
</action>
</keybind>
<keybind key="XF86AudioMute">
<action name="Execute">
<command>amixer -q sset Master toggle</command>
</action>
</keybind>
altere a opção amixer -q para "amixer -D pulse". o arquivo deve ser como o seguinte:
<!-- Keybinding for Volume management -->
<keybind key="XF86AudioRaiseVolume">
<action name="Execute">
<command>amixer -D pulse sset Master 3%+ unmute</command>
</action>
</keybind>
<keybind key="XF86AudioLowerVolume">
<action name="Execute">
<command>amixer -D pulse sset Master 3%- unmute</command>
</action>
</keybind>
<keybind key="XF86AudioMute">
<action name="Execute">
<command>amixer -D pulse sset Master toggle</command>
</action>
</keybind>