Hi Mario,
Have you tried to enable the 'Intel Smart Sound' in BIOS setup?
Before Ubuntu boots, press the 'Esc' key, then go to 'BIOS setup' -> 'Advanced' 
-> 'Built-In Options' -> ' Intel Smart Sound'.
Exit and save changes.

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https://bugs.launchpad.net/bugs/1536948

Title:
  [Solved!][HP ProBook 430 G3, Conexant CX20724, Speaker, Internal]
  Underruns, dropouts or crackling sound

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