I'm using Xubuntu 14.04. I solves the problem by setting 
/Net/EnableInputFeedbackSounds and /Net/EnableInputFeedbackSounds to true. By 
default their values are false. You can do this in setting manager or in 
terminal.
xfconf-query -c xsettings -p /Net/EnableEventSounds -s true
xfconf-query -c xsettings -p /Net/EnableInputFeedbackSounds -s true
I'm not sure if this applies to other Ubuntu flavours.

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https://bugs.launchpad.net/bugs/1492208

Title:
  No notification sound in thunderbird and lightning

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