[Bug 1492208] [NEW] No notification sound in thunderbird and lightning

[Bib]

Public bug reported:

14.04.3 TB 38.0.2
Neither for new mails nor events

I checked Sound effects aren't muted in control center, and main sound
too isn't too low to be audible.

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  No notification sound in thunderbird and lightning

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